The HTC-built G1 has been a huge hit for T-Mobile here in America, but up until now, it hasn’t been sold in retail locations that weren’t situated in areas blanketed with 3G coverage. Starting this weekend, anyone within range of a T-Mobile USA store or partner location can find the Android-powered cellphone. It has been possible for those in EDGE (2G) areas to order the mobile phone through the carrier’s website for months, but unless you traveled any great distance to see one in person, you were taking a substantial