So I had an iphone 5, just got an iphone 7 (reconditioned one).
When I swap the SIM over to my new phone, it doesn't work. No calls/texts or any network. Just says "no service".
If I put the SIM back in my old phone, it all works fine.
What have I done wrong or need to do on my new phone....?
Thanks for the post Markymark22.
It doesn't sound like a SIM card, have you confirmed if the handset is unlocked and can accept the SIM?