Phones Key » Cricket Phone Operator » Can I use a GSM SIM in a CDMA R-UIM phone?

  #1 (permalink)
: I know you can put a R-UIM into a GSM phone and have it work properly but what about the other way around? AT&T is in the process of buying Cricket Wireless and switching to a GSM network. My phone has a R-UIM slot for 4G capabilities but will I be able to use a GSM SIM?

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  #2 (permalink)
: No. They are not compatible.
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  #3 (permalink)
: Maybe...........some cards will work while older cards will not, sorry you must try it to know for sure.
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