I currently have the $15 monthly base plan which includes unlimited texting. My add on is the 100 Canada wide min for $10 a month. I use wifi at home, malls etc. However I'm considering the 500 mb data booster for $20.00. I bought a top up card for $25.00 yesterday. Do I top up my account first with the top up card, then select the data booster add on? When my data is used up and I decide I don't need this booster anymore am I able change/delete it on prepaid self serve or do I call customer service? My phone is a Blackberry Q5. If I'm in an area with free wifi is there a way to switch off data so I can save it? Thanks!