Is US Mobile a GSM carrier?

Yes, US Mobile operates on the GSM network (Global System for Mobiles). It’s easy to swap phones on GSM networks, because GSM carriers put customer information on a removable SIM card. If you take the card out, put it in a different phone, the new phone now has your number.

The other network is called CDMA (Code Division Multiple Access) and does not use SIM cards.

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