4g is very tricky on the indulge may be there was a 4g outage. Most people will confirm better results with 2.2.2 since it flashes new modems to the phone. However results will vary and that depends on metropcs 4g layout. 2.2.1 is buggy and drains battery way too fast, try a few more flashes with 2.2.2 it fixes battery problems otherwise re try basix since its better on the phone than stock 2.2.1
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