Why is my iphone 6 not activating with Straight Talk?

I bought an iphone 6 at the Apple store in London, so it's unlocked. Straight Talk is my provider. They sent me a sim card for it and called them and they transferred over my service, but when I put in my sim card, I get no service. It gives me a message that says phone is activated, but I have no service. I even waited over 4 hours. Does anyone know what the problem is?

It can take up to 24 hours before your Straight Talk phone is activated. Straight Talk will not help you until you wait 24 hours after you first attempted to activate your Straight Talk phone. I would wait until it has been 24 hours, then contact Straight Talk again and tell them that your phone did not activate.

Don't worry, it might take more than 8 hours before you get your service, sometime 24 hours. So don't panic. If you still have No Service after 24 hours, call them 1-855-222-2355.