Will a Iphone 3g unlocked still work on AT&T?

Ok i got a iphone 3g that jailbroken and can run on T-Mobile.
I want to know if i can still use a AT&T Sim card in it and it will work for AT&T or do i have to deactivate the thing that is making it unlocked?

Any good iPhone apps for photo editing?

I don't want to download Instagram… I'm looking for an app used for adding text, photo-shopping, and cropping photos. I've already tried Aviary which I really like, but I can't photo-shop them and can't change the font of the text. Filters are okay, I don't need them, just those three specific things.

Because mainly, I want to make edits like this: image

Any iPhone apps come to mind and please nothing over five dollars?

Plants vs Zombies 2 hack or Cheat for iPhone 5?

I have just installed Plant vs Zombies 2 on my iphone 5 and the game is great, but it would be amazing if it was a possiblity to add some more gems or coins?
So, is there any working Plant vs Zombies 2 hack?

Where should I take my iPhone?

I have taken my iPhone 4 to numerous labs and each one of them ruined it a little bit more. While in the beginning I just didn't have RIL (Phone, SMS, 3G) working now the back camera, Wi-Fi and bluetooth aren't working either. Additionally the home button is a bit stuck. I opened it up and I saw I'm missing some part. This part which sits on the battery connection to the logic board https://iphonerepairmiamibeach.com/store/iphone-4-gsm/battery-fasting-piece is not there while all the other connectors are connected appropriately. I was wondering if that piece or (https://iphonerepairmiamibeach.com/store/iphone/heat-dissipation-mother-board) this which is also missing can possibly cause these issues. And also another question is how do I send my iPhone to Apple for repair because they are the only ones I can trust anymore with it, where can I find more information about this?

Added (1). I would like to mention that I don't have a retail Apple store in my country (Israel) and I would want to know about shipping it overseas, shipping prices and the possibility of it. And if I even should try that instead of just buying another phone because of the price.

What app is used to make edits like this?

I find the edits like this hilarious: image I want to know where to make them. And are there any similar apps for iPhone? If so, could you list some? I'm not looking for filters or brightening tools or anything, I just want an app used for adding text and photo-shopping.

Iphones 4s not receiving Wi-Fi signal?

HI, i have a iphone 4s which is unable to receive a Wi-Fi network signal. I have tried all the resets, and they did not work. The phone is out of warranty so i was able to replace the Wi-Fi flex cable, and the Wi-Fi receiver module, but still no signal. Has anyone resolved this problem before?

Added (1). Edit: It is not able to find any network. My home network works fine on everything else, including my other iphone 4s. The Wi-Fi toggle in the settings menu is *greyed out*, and unable to be toggled to on or off.