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Why my T1 can't use the 3G network sometimes?

Sat,29,March 2014:03:29 marketing 3682 Comment Latest

There are two SIM card slots on the T1, SIM 1 and SIM 2.

For SIM 1, it supports 2G and 3G.

For SIM 2, it supports 2G only.

If you don't put 2 SIM cards in it, you can choose SIM 1 first.