Dust under iPhone 4s screen?

So i'm wondering i'm going to buy a iPhone 4s because its dropped to $99 and i heard that Iphones have a problem with dust under the screen the iPhone 3 and 3s are the worse and i love perfection i take care of my electronics and I'm paranoid about this the iPhone 3 and 3s has this problem and there has bean that problem with the iPhone 4 a little and i've only Seen one report of dust under the 4s so has apple used glue like the iPod touch 4g to fix this and is it rare for this to happen or has thus never happens with the 4s.

How to figure out which carrier my Iphone is on?

I got an Iphone 4 not too long ago, bought it off of someone. I had to reboot and restore the phone and its back to the welcome setup page. I have my Bell sim card installed in but when I try to set up my phone, both on Itunes and on the phone itself quotes that my sim card is not with the proper carrier and to put in a card with the proper carrier. I was wondering if there would be a way to figure out which carrier it is on so I know which sim card is needed.

No Service after update

OMG
So my dad had unlocked my iphone from someone after it was locked to Bell.
Then he told me not to update but I did anyway and got ios 6 before i had 5.1.1 (i think)
So then when I restored my iphone and everything there was no service and after searching for forever and then it started searching again and again but it keeps coming up as NO SERVICE! WHAT SHOULD I DO!

Is it possible to use an AT&T iPhone on Verizon Network?

I'm wondering if it is possible to use an iPhone from AT&T on the Verizon Network. My coworker has an old one and is willing to give it to me but I'm not sure if I could use it on Verizon since I do not want to switch to AT&T. I read something that said it was impossible from T-Mobile to Verizon but I didn't know if it was the same with AT&T.

Does IMessage on the iPhone 5 use a lot of data?

My data allowance a month is 2 giga bytes and I tend to text a lot. I also use Pinger ( a free texting app as long as you have Wi-Fi or 4g LTE so it pretty much uses my data also.) so I was wondering if this would eat up all my data allowance very quickly. I send about probably less than 30 text messages a day using 4g LTE so would this use all the data?

How to get back my contacts?

I restored my new iphone today and i wasn't thinking so i lost all my contacts and i don't think it backed up to my computer before doing so. I don't have high hopes on getting back my contacts but is there any other way? Its a brand new iphone so i guess its never been backed up anywhere and my old phone is restored also for my sister to use so i don't have them on that phone.

Any other ways to try and get them back?

Instagram keeps crashing on my iphone 4s?

I've recently update my iphone 4s to ios 6 and instagram keeps crashing when I try to take a picture and add a filter. Not sure what wrong since i've updated to the newest instagram app, deleted it and re-downloaded it, and restarted my phone with the same results. Any input would be helpful.

Why is my battery draining on my iPhone 3Gs?

I just got an IPhone 3Gs that I ordered new on amazon. The phone came unlocked and Tmobile is my phone carrier. Before I even turned on the phone I let it charge to 100% and now that i started using it I've noticed that the battery is literally draining a percent or two every minute. I have blue tooth, 3G, and airplane mode turned off as well as the backlight turned down.

I have heard from a few different people the the iPhone 3G is one of the worst models when it comes to battery life, but they can't be as bad as one percent per minute.

So what I'm wondering is it because of the fact that my iPhone is unlocked that's causing the battery to drain so fast? I've done some research online and seen people complaining of the jailbroken apps such as Cydia making there phone die quickly. I checked and I don't have any of those apps.

So is anyone one else with an Unlocked iPhone 3Gs having the same problem and if so what can I do to fix this or improve the situation.