We are verizon customers and just use the international plan as it is $10/24 hours and it allows me to use my text/talk/data plan. We don't use every day so it only averages 40 per week. The nice thing is it reminds you when your 24 hours will be expiring and the next charge/24 hour period doesn't start until you use it again.

You can still use your phone with wifi just put in airplane mode