I use $100 of prepaid credit with Telus (I'm in Canada) and it lasts me a year. I mostly use my Android phone for the wi-fi. Most providers offer a free sms ser

I use $100 of prepaid credit with Telus (I'm in Canada) and it lasts me a year. I mostly use my Android phone for the wi-fi. Most providers offer a free sms service online and I use Google Talk for free phone calls.