I didn't upgrade my iPhone from 3.0.x to 3.1.x for months because I wanted to keep tethering through the unofficial carrier hole as my carrier then didn't suppo

I didn't upgrade my iPhone from 3.0.x to 3.1.x for months because I wanted to keep tethering through the unofficial carrier hole as my carrier then didn't support tethering. I ended up paying for the SIM unlock and porting my number away from that carrier.