It's not a bad idea, but it doesn't replace it. VOIP on your data adds a delay to the phone call (believe me, I used to do that and it really was noticable). For texting it's fine, but then you would be stuck with 2 phone numbers... As I said in an o...
The sad thing is that I was about to switch both my parents to Public Mobile on the 90$ per 90 days plan with de 1GB of data, unlimited province talk and unlimited Canada text but now that plan doesn't exist and you can't go lower than 111$/90days if...
