How long do iPhones normally last? - 1

My upgrade is coming up in a few months (I'm with AT&T), and my mom said she'd give me her iPhone (that she's had for about 1 year now- I think it's the 4s) instead of buying me a new phone.
I'm not picky about phones (I've had the LG Vu and the LG Vu Plus, and my moms old Blackberry Curve), but if she gives me her iPhone, I don't want it to start malfunctioning in a year or two.
So how long do iPhones normally last- their durability and battery- if you take care of it?

Why does my unlocked iPhone 3GS stay locked?

I jailbroke it with redsnow, unlocked it with Ultrasnow a million times over and it remains locked. Using baseband version 05.13.04 with 5.1.1 iOS. Calls and text work fine, but no data, no matter what. Use Wi-Fi in my house, but that's all i can use. I've spent a week doing this over and over and nothing seems to work. Tried dozens of videos online, countless blogs and i followed every, single step x amount of times. Using straight talk right now, should I try T-mobile maybe?

Verizon iphone 4 showing apple logo then turning off?

Please help me. I bought this iPhone 4 off of ebay. When I got it, it was working fine, but then I noticed in mid use, it would just shut down. I thought it was a one time thing so i didn't sweat it much. I connected it to the charger and turned it on, it was working in perfect order, until I disconnected it, it shut down, which was weird, since the phone read 100% battery. Then after that when I would try to turn the phone on, it would just show the apple logo, and turn off. Now I thought it was a bad battery, so I bought a battery and replaced it. After that the problem persisted. Does anyone know what's wrong with it?

Bell VS ROGERS WIRELESS Which Is Better?

I was planning on getting an iPhone 5 and am undecided on which service is better for cellphones i'd like to know some of your experiences with them on which service is better? What one should i get

Sound on my new iphone 4 is low?

Well I just got my new iphone yesterday and whenever I try to do anything with sound the sound is super low! I hve checked the volume and it says its all the way up! What do I do?

How to block people on iPhone?

I have an AT&T iPhone 4S with iOS 5.1.1, and I have this number I don't want calling or texting me. Is there a way to make it so I ONLY get phone calls and texts from my contacts? Or if there's a way to block certain numbers that would be cool. And if I block them, would I myself still be able to text them?

Can you combine two separate Apple ID s?

Okay so here is the story…

I had an Apple ID for my iPod touch when I was in junior high and downloaded all of my CD's and bought some movies and albums.
Now after graduating High School I have a iPad and iPhone on another Apple ID because i could not remember my old password. Now I have all of my apps and contacts and iCloud account hooked to the iPad and iPhone. I also have more music and alot more purchased music from iTunes on this account.
today I figured out my password for the old account from junior high and wanted to know if there was anything I could do to combine the two accounts or the easiest way to get ones music and apps to the other.