I use the $30/mo T-mobile plan with my Galaxy Nexus in conjunction with porting my original number to google voice. I use grooveIP to make VOIP calls with my g

I use the $30/mo T-mobile plan with my Galaxy Nexus in conjunction with porting my original number to google voice. I use grooveIP to make VOIP calls with my google voice number (unlimited minutes) but will usually use ~70 of my 100 minutes a month when I feel the need to turn grooveIP off to save battery or if my data connection is spotty. I highly recommend the whole setup. The only downside I have seen is that group text messages/ MMS dont work with google voice. I just give my close friends my direct t-mobile number for that stuff.