iPhone 5s activation
I Bought iPhone 5s on the old cdma cricket and I am trying to migrate to the new cricket gsm but can't I get a message that the SIM card is not valid. I went to cricket and they said that that doesn't happen because you just need a SIM card as long as you have A newer iPhone it should work on the new gsm network. They didn't help they just said go to the Apple Store. So I did go and they didn't help either. I don't know where I can use my phone. I also had this phone replaced 2 times because the original had problems I don't know if it is because of that maybe Apple gave me a wrong refurbished one.
iPhone 5s, iOS 8.3