My iphone 4 facetime only works with Wi-Fi

I transfered it from at&t to straight talk and now it only works with Wi-Fi, says there's no network connection but the internet works?

Did you unlock the phone to work with networks besides ATT? If not it won't connect to other systems! Wi-Fi connects you to the internet but does not connect the phone portion unless the phone is authorized, it can't be if it is locked.

  • Why would Apple make FaceTime only compatible with iOS devices? It doesn't make sense what if someone has an Android! Then FaceTime is useless to the person with the iPhone who wants to video chat with the person with the Android. Someone please tell me why Apple did this, I know it's a stupid question but its bugging me
  • Verizon iphone 4 only works when plugged in? My girlfriends verizon iphone 4 only works when it is plugged in. The battery is new because we had it replaced recently… The only thing is that it only comes on when it is plugged in. Can it be something loose? Because it was taken apart before?
  • My iPhone 4s internet only works on Wi-Fi? The only time I can use the internet on my iPhone is when I'm on Wi-Fi. Whenever I try to use the internet with 3G it doesn't load at all. I have a data plan and when I check my usage online it says I haven't used any data. I'm not sure what is going on. And Siri doesn't work well either on 3G even when I'm not asking it to do anything involving the internet
  • My iPhone 4s camera only works on FaceTime? When I go onto snapchat it says my camera restrictions are on but they aren t. On Twitter instagram and normal camera it is just a black screen but on FaceTime both cameras work