Does US Mobile use CDMA or GSM?

US Mobile is a GSM carrier . In general, an unlocked GSM phone from AT&T and T-Mobile will work on each other’s networks. If you have a locked device, your carrier can unlock it if you meet their individual criteria. Older phones from Verizon and Sprint, on the CDMA network, don’t operate with a SIM card.

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What is super LTE?

The Super LTE (black SIM card) works on phones that have the HD Voice Calling feature enabled by default from the phone manufacturer . Depending on what region the phone is made for, almost all Apple, Samsung, Google Pixel and OnePlus phones work really well with the Super LTE SIM card.

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