Brand: Consumer Cellular. MPN: 17189273. With our SIM card, you can connect a device you already own to Consumer Cellular service. To be activated on our service, your phone must be unlocked by your previous carrier, and be compatible with GSM network technology. Our SIM card most commonly works with phones used on AT&T or T-Mobile service. Inserting and activating a SIM card is quick and easy, and there are no activation fees.