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Using a 3G card in a 4G phone

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I'm seeking both a generalized answer and a specific answer:
Generalized: What will happen if one installs a 3G SIM card into a new unlocked 4G phone?

Specific situation: I'm looking to install a 3G micro SIM card from Straight Talk (AT&T) into a BLU Life One phone (When it releases (bit.ly/15Ck6Qc)). The 4G T-Mobile SIM card version has absolutely no service at my location and isn't an option. Will having a 3G SIM card installed into a 4G phone cause me to have any problems?

Thanks in Advance!
 
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