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Discussion in 'HTC ThunderBolt' started by shawtyredd33, Feb 17, 2011.
What is the sim card for?
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i assume your talking about the LTE SIM card... its required and included in all 4G LTE phones in order to use 4G network
Would the TB work without the SIM card if you only use 3G?
The TB is backwards compatible so yeah, it will work on 3G