What is the Alternate solution of SIM card?

Some mobile phones use SIM cards, other don't. The phones with SIM card slot allow the user to change the SIM; this way you can change the telephone number, or you can log to different networks (providers). SIM cards have not any alternative solutions.

First answer by Scttschic. Last edit by Fern. Contributor trust: 93 [recommend contributor]. Question popularity: 127 [recommend question]

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