Question: are all iphone 8 cdma and gsm?
Answer: However, there's an important caveat here when it comes to AT&T and T-Mobile: while the SIM-free iPhone 8 will work with CDMA carriers (like Verizon and Sprint) and GSM carriers (like AT&T and T-Mobile), the iPhone 8 for T-Mobile and AT&T will only work with other GSM carriers.