Why won't my iphone make calls or send messages?

I inserted a sprint sim card to my sprint iphone and the bars appeared on the left but i tried making a call and it won't work, i can't send messages either. The sim card is activated and i know the phone is sprint for sure.

Check with Sprint if that's the case

  • Why won't my iphone send pic messages? I have an at&t iphone 4 on pay as you go, it worked perfect all the way up to 5.1.1 software then when i updated to the 6.0 and so on it will not let me send or receive pics. What can i do to fix this problem?
  • Why won't my verizon iPhone 5 send messages to certain people? I have a friend who has verizon and it sends messages to him very fast and I have friends who have different carriers and it won't send to them. The send bar keeps on going and stops at the last second. I have turned it off and on again and I have reset my network settings. Nothing has worked at all.
  • Why won't my new iPhone 6 (AT&T) send or receive texts/calls? I activated it two hours ago and backed it up with the data and phone number from my old iPhone 4. Both phones now read AT&T and show cellular signal and data in the top left hand corner. But when you text or call my phone number, the iPhone 4 receives it. Why won't my new phone receive it?
  • Why won't my iPhone send picture messages? I have an iPhone 4 and every time I try to send pictures it gets to where the sent bar is almost full, then it just stops and won't send. What do I do? I've tried restarting my phone and it didn't do anything. It is on my plan though. I just sent a picture message yesterday but now it's f*cking up.