The Verizon phone uses CDMA so there is nowhere to put a GSM SIM. But a bit of hacking allowed him to add a SIM card slot to it. Even though he’s not the one who originally found this hack (XDA ...

This allows for a seamless interchange of the same SIM card between different GSM mobile phones. SIM cards also serve as storage for SMS messages and the user's contacts. Current SIM cards can ...

Those CDMA-compatible phones were ... With LTE being built off of GSM and HSPA standards, and not CDMA standards, LTE ...