Is it possible for two Sim cards to share the same telephone number?

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Some companies do offer this service.
 

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yup, if u ask for a replacement card as well when u purchase  

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No, actually. Sim cards were created for SECURITY. Remember back when people were "cloning" (duplicating IMEI signatures to make calls on other peoples phones)? Can't do that now. If a replacement SIM is activated, the old sim is automatically DEactivated.
No two cards can be simultaneously active with the same number.
Furthermore, once deactivated, it can't be re-activated. At least not without some inevitable device is created for "wiping" or "resetting" a SIM.
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First answer by ID3526767888. Last edit by AndreWerk. Contributor trust: 5 [recommend contributor recommended]. Question popularity: 111 [recommend question].