Can i put my at&t sim card in a tmobile phone if its not unlocked?

lexi1892ixel

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my friend is switching to verizon and said shell give me her tmobile sidekick...


can i out my at&t sim card in it or do i have to get it unlocked first??
 
You have To unlock your friend Sidekick Phone from T-mobile network.Then only you can use AT&T Network Sim card in the Phone otherwise without unlocking you cannot use other GSM network sim card.To Unlock Sidekick phone get the unlock code from the site Wickedunlock.com/supported-phones/rs11wp7/ unlock it easily.After Unlock it use only GSM network Sim card...You cannot use CDMA Network Sim card.
 
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