You could use it for extra storage.
Unless you opt for a bigger storage option like 64GB or 128GB, your iPhone is bound to fill up quickly. You can always use your old iPhone to store some extra files.
Use it as a music player.
Afraid you'll drop your giant iPhone 6 Plus when you're out for a run? If your music library is already on your old iPhone, you can always use it as an MP3 player for those times you may not want to bring your new phone with you.
And while you're at it, you can use your old iPhone 5s as a step counter.
The iPhone 5s has a co-processor in it that keeps track of your health data. If you don't want to bring your new iPhone 6 on a run with you, the iPhone 5s will serve as a great pedometer and music player.
Use it to entertain your little brother or sister.
There are tons of child-friendly games available in the App Store. If you're not using your iPhone 5 anymore, chances are your little brother or niece will be more than thrilled to use it as their personal gaming console. After all, you wouldn't want to hand over your brand new iPhone every time a toddler reaches for your phone.
Pair it with some accessories to make it the ultimate travel camera
From Olloclip's 4-in-1 lenses to flexible tripods, there are plenty of camera accessories to choose from. If you ever feel the need to take some adventurous photos but don't want to worry about dropping your phone, use it to take some awesome photos.
Mount it and use it as a baby monitor.
Your old iPhone still has a pretty good camera on it. Instead of going out and buying a monitor for your nursery, set up your old iPhone and use the Cloud Baby Monitor app to use your old phone as a baby monitor. The app works with any device that can connect to Wi-Fi, and streams footage to nearby phones and tablets, as USA Today's Jennifer Jolly points out.
Or, use it as a security camera
The same principle applies to using your old iPhone as a security camera. Apps like Presence allow you to discretely mount your old phone and use it to keep tabs on your home.
Use it as a stereo next time you have a party.
If you're hosting a party, you probably don't want to leave your phone plugged into speakers the whole time. And connecting via Bluetooth for the whole night will probably drain your battery. Plus, you'd have to stay within range of the speaker. Connect your old iPhone to a pair of speakers instead, this way you can keep your phone on you without worrying about it.
You can still use it for Netflix, Hulu, and other streaming apps on your old phone.
Just because your phone isn't activated doesn't mean it's useless. As long as it can still connect to WiFi, you can still use it to watch Netflix, browse the Web, and anything else you would need the Internet for. And if it can't connect to WiFi for some reason, you can still watch any videos or movies you've downloaded.
