I am terrible when it comes to remembering numbers. But, honestly, who remembers numbers anymore these days. That's what your iPhone is for. Just plug the number in, store it and access it whenever. Well, whenever the phone isn't dead. This has only happen to me a few times. But, a few times too many. So, a friend told me about Piggy.Back.Me and I tried it out. It really is a good idea to backup your contacts. But, it's also a cool idea to be able to back them up to the cloud and access them from other devices when needed, or when your phone dies. I like this app. I like the name of it. And, I like how it provides me security for those times when I'm out and about, without access to a charger.