Erasing or “resetting” your Android device takes a few steps and some time, but first make sure you have backed up all your own personal data and photos, because the process wipes everything from the tablet. You should also sign out of any accounts for third-party services like Microsoft Office, Twitter or Yahoo, and remove any external storage cards used with the tablet.

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Start by opening the Contacts app on your Android device and selecting the contact you’d like to dress up with a photo. Tap the pencil-shaped Edit icon in the lower-right corner; if you have multiple accounts on the device, you may be asked to pick one here.

Android offers two ways to add an image to a contact file. You can snap a new photo right there if your acquaintance happens to be with you, or you can pull in a picture from the device’s photo album.

On the Edit screen for the person’s card, you can edit the name, the address, the phone number and other information by selecting the corresponding text field. To add a photo, tap the camera icon in the center of the circle at the top of the card. In the box that appears, you get the option to take a new picture right there or to choose a photo from the albums on your Android device.

Once you select a photo, you can resize and crop the image to your liking. Once you have finished editing the card, tap the Save button in the upper-right corner.

If you are using your Google Account’s default sync settings, the edited contact card updates itself across all the devices connected to the same account, including the Google Contacts app for desktop web browsers. Likewise, if you have more photos of people on your computer, you can add those pictures to your contacts by following the same editing steps through the Google Contacts app in the web browser and then syncing them to the Android device.

The process is similar for those with Apple devices wishing to add pictures to iOS, macOS and iCloud Contacts. When you have edited the contacts, added a photo and saved the card, the updated version should be available on all the devices using the same iCloud account.

Many unexpected outgoing calls occur when you do not flip on the lock screen when shoving the phone in a purse or pocket. Without the lock screen to temporarily disable input to the phone’s screen or buttons, accidental brushes, taps or bumps can trigger a phone call or garbled text message, especially if the phone was left with the contacts app or keyboard open. (When unlocked phones shoved in a back pocket make a call this way, the incident is colloquially referred to a “butt dial.”)

If your phone seems to be accidentally dialing someone because of screen bumps or inadvertent voice commands, check the settings to make sure the device’s lock screen is enabled and voice-activated calling is not.

Glitchy system software and malfunctioning screens can also cause unplanned communications. Apple’s Siri, Google Assistant, Microsoft’s Cortana or any voice-activated apps may jump in and make a phone call if the software is set to listen for spoken commands and misinterprets your words.

To help prevent accidental calls and text messages, make sure you hit the Power/Sleep/Wake button to turn off the screen before putting your phone away. In your phone’s display settings, you should also be able to set the amount of time before the phone shuts itself off, and choosing a minimal period helps if you forget to manually switch off the screen.

If you do not have a lock screen and passcode set on the phone, you should add one to prevent unauthorized access to your device from other people (as well as your own body parts). On the iPhone, open the Settings app and choose Touch ID & Passcode, to get to the relevant controls. On an Android phone, go to settings to Security & Location to set up the screen-lock method of your choice.

If you your phone is set to respond to spoken input, like voice dialing or waking up when you say “Hey, Siri,” “O.K. Google” or “Hey, Cortana,” your device may also be more prone to accidentally calling out on its own. These features can be controlled in the phone’s settings as well.

With the holiday season upon us, families will soon gather for the big annual exchange — not just gifts, but also memories.

For taking photos, smartphones have been a blessing because they include excellent, easy-to-use cameras that people carry everywhere. But the downside is that sharing large batches of digital photos among multiple relatives is hardly straightforward.

No family enjoys huddling around and squinting at the small screen on Grandma’s smartphone as she swipes and narrates her vacation in Florida. Even worse is when a sibling bombards you with dozens of text messages of photographs of his baby, burning through your data plan. And let’s not forget the uncle who still carries around a thumb drive.

Fortunately, big tech companies like Apple and Google offer tools to quickly and efficiently share pictures. But the problem is many of those features are buried in their increasingly complex operating systems.

“There are a few really clever photo sharing tools, but as smart as they are, you might still need to teach family members how they work,” said R. C. Rivera, a professional photographer in San Francisco.

So here are some tips for the quickest and most efficient ways to share digital photos, based on interviews with professional photographers.

Sharing With Google Photos

If you have a modestly sized family, chances are some members use iPhones but others use Androids. The quickest method for everyone to share pics is to rely on a photo storage service that supports both devices.

Mr. Rivera said that most of his family in the United States used iPhones, but that his relatives in Asia all used Android devices. So he goaded his family to use Google Photos, which is included on Android devices and works on iPhones.

After you sign up for Google Photos, each photo you take is automatically backed up to Google’s cloud. From there, you can create albums for your trip to Spain or your 2-year-old’s birthday party to share with other members of the family with Google accounts. You can also create public albums that anyone can see with a web link.

To make sharing more effortless, you can also take advantage of some neat artificial intelligence. Google Photos detects the face of a person and automatically groups all the photos of that person into an album. From there, you can set up Google to automatically share photos of that person with others — which is great for baby photos.

To do that, inside the Google Photos app, you add a partner account that you want to share with, like your spouse or relative, and then select the option to share photos of specific people. Then select the subject you want to share. If you want to keep people up to date with photos of your toddler, this is a quick and efficient method. (An added bonus: This trick also works for dogs.)

Google Photos is cheap. Google offers to store an unlimited number of compressed images for free. For full-resolution images, you get 15 gigabytes of free storage and can pay at least $2 a month for 100 gigs.

Moving Photos Between Apple Devices

For families that entirely rely on iPhones, there’s a major benefit: the ability to share photos among devices almost instantly. Apple phones and computers have AirDrop, a tool that transfers pictures directly between devices via a wireless Bluetooth or Wi-Fi connection.

Unfortunately, this useful feature is difficult to find. In iOS 11, the latest mobile operating system, you swipe up from the bottom of the screen and hard press in the upper-left corner to open a hidden menu that includes AirDrop. From there, you can set up AirDrop to receive photos from everyone or just people on your contacts list.

To share with AirDrop, make sure your relative nearby has AirDrop receiving turned on. On your iPhone, you can select a photo or a group of photos and tap the Share button (a box with an arrow pointing up). Your relative’s device will show up under the AirDrop menu, and you can select the device. The files will move over instantly — even a batch of 50 photos will take only a few seconds.

Slide Shows on a Big Screen

Your older relatives are probably familiar with the tradition of using a slide projector to show vacation photos or talk about family events. You can do something similar to that with a smartphone, a television set and a media streaming device.

First, pick your streaming device. Google’s $35 Chromecast, a small dongle that can be plugged into the TV, is perfect for families using Google Photos. For those relying on iPhones, a $149 Apple TV is also great.

After you set up your streaming device, beaming your photos to the television set is a breeze. In the Google Photos app, a small broadcasting icon will appear in the upper-right corner. Tap that while you are reviewing photos, and they will beam onto the television screen.

With an Apple TV, the process is just as simple with the tool AirPlay. On your iPhone, open the photo album you want to share and hit the Share button, and then tap AirPlay. The photos you are looking at on your phone will show up on the television screen, and you can narrate your trip to Hong Kong while swiping from photo to photo.

Print Your Albums

There’s always the old-school option of printing out your photos for a physical album. There are several different apps you can use to skip buying a printer.

The easiest option for Google Photos users is to just print directly through Google. A photo books tool lets you compile photos into a book.  Dragging some favorite photos from your trip to Japan into a photo book will be a breeze. A 20-page book costs $10; each extra page costs 35 cents.

There are other options if you want to assemble an old-school scrapbook. Online printing services let you upload photos and order prints in different sizes. Wirecutter highlighted Nations Photo Lab as its top printing service that offers high-quality prints for a good price.

Mr. Rivera, the professional photographer, takes the route that requires minimal effort: He regularly prints Google photo books for his relatives. The color accuracy in the photos is not perfect, but the outcome is good enough.

“As a photographer I would scrutinize the color,” he said. “But for 90 percent of the population, it’s perfect. My parents wouldn’t notice.”

Some smartphone apps that are designed specifically for scanning or capturing digital versions of photographic prints can do a bit more than just take a picture of the picture. When searching for a portable scanning program, read its listed set of features on its app store page — tools like edge detection, perspective correction and color enhancement can make a battered print look much better after its digital conversion.

Google PhotoScan, which was released last year for Android and iOS gadgets, is one free app with a lot of tools for turning your photo prints into decent digital copies; for a visual introduction to the software, a demonstration video is available on YouTube. To scan a picture, you move the camera over several areas of the print as the app guides you. PhotoScan then merges all of the parts and removes any glare from the light in the room. The combined image is straightened, cropped and color-enhanced to make it look as good as possible. You can save it locally, or if you use Google Photos, you can automatically back up your PhotoScan files to the cloud.

Other photo-scanning apps to check out include Photomyne, which has free basic and $5 versions for Android and iOS devices and can capture multiple images at once. Apps to convert documents as well as photos include TurboScan (for Android and iOS) and CamScanner, which offers versions for Android, iOS and Windows Phone.

If you have boxes of old albums that you want to digitize, you need negatives or slides converted, or have damaged photos in need of repair, a professional service like Memories2Disk or RetroMedia is another option.

f you have a Mac did you know you can run Windows 10 on your Mac.  Here are some details on how to go about it.

The Boot Camp Assistant software that comes with the Mac operating system guides the installation of Windows onto a separate partition of the computer’s hard drive.

Boot Camp, Apple’s tool for the Mac that allows you to install and use the Windows operating system on a separate hard drive partition, is capable of running Windows 10 — if your hardware meets the system requirements. According to Apple’s guidelines, the earliest iMac model that supports running Windows 10 is the “Late 2012” edition with either a 21.5- or 27-inch screen.

Apple released its 2012 model in September of that year, so if you got the iMac before Nov. 30, you may have the previous version — which is not on the list of supported hardware for using Windows 10 through Boot Camp. You can see which iMac model you have by going to the Apple Menu in the upper-left corner of the screen and selecting “About this Mac”; the name of the model is listed on the Overview tab. (If your iMac does not meet the requirements, check out software like Parallels Desktop for Mac that lets you run Windows 10 alongside macOS instead of installing and running Windows from a separate hard drive partition.)

If your iMac passes muster for Boot Camp, make sure you have 55 gigabytes of free space on your start-up drive and an empty USB flash drive with a capacity of at least 16 gigabytes. You also need a copy of the 64-bit version of Windows 10, which you can buy as a download or on a USB drive from Microsoft.

Before you start installing Windows 10, make sure your Mac’s software is fully up-to-date and back up your computer just in case something goes wrong. If you have not created a partition on the Mac before nor installed Windows on it, go to the Mac’s Applications folder and to the Utilities folder and open the Boot Camp Assistant program to get started.

If you already have a Boot Camp partition with Windows 7, you can update it to Windows 10 as you would on a PC. If you want the very latest edition of Windows 10, the Creators Update released this month (April 2017), Microsoft says to install the Windows 10 Anniversary Update first and then update the system to the Creators Update.

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