I know some cities use 311 for city based services (Chicago does anyway). I was able to dial 311 from my AT&T and I think my Verizon phones, but when I try to dial 311 from my Tmobile 8900 I get "The number you have dialed is not in service..." Sometimes it is necessary to dial 311 and I would like to know if anyone knows how to enable this number. Thanks in advance!