I reset my iphone 4 and now it says my sim is invalid?

Got my son iPhone 4 for bdy, it was in a real muddle, me having never had an iPhone before decided to reset it?! So I've reset it but now it says the sim is invalid. It is a talktalk sim card, do I need to call talktalk to get it unlocked again?

Yes, call your provider for help.

  • Why does my iphone say invalid sim and etc.10.points? My iphone 5 from verizon says invalid sim. It won't let me get on the internet or text or call away from home but when i get home it works just fine. This started happening a few days ago
  • Why does my iphone 5 say no sim or invalid sim? On the top left corner my iphone 5 says invalid sim or no sim and i don't know why this happeneds i need help to fix it. I turn my phone off and then back on and it seems to work but this happeneds daily now.
  • My straight talk iphone 6 says that the number I have dialed is invalid? EVERY number i dial it says that it's invalid, but i know that its not. These are my saved contacts and i know that their phone isn't shut off. I have tuned my phone off and back on, i have taken out my sim card. I don't know what else to do, but i need to make phone calls.
  • My iphone4 says invalid sim or no service? My iphone4 was given to me from my aunt and when i was activating it as mine, i had a problem when i connected to itunes, it says my iphone doesn't support my sim card, so later, i put on my aunt's sim card than it connected to itunes and its done. So now my iphone 4 shows menu bar but when i insert my sim card, it says 'no service' or sometimes 'invalid sim card'.