You wouldn't be charged for voice roaming if you use data, but if you use data you will be charged data roaming. If you limit your usage to wifi then you won't be charged voice or data roaming.
Originally Posted by cloudstrife1ph
Unlocked iPhone 5, unlocked iPhone 4
Unlimited airtime, Unlimited CAN/US long distance, Unlimited SMS to CAN/US wireless numbers
2500 Call Forwarding minutes to CAN/US numbers
Google Voice for visual voice mail with message transcription, conditional greetings, unlimited messages (vs 35 message cap), remote retrieval from any PC or phone, no auto-purge after 10 days and most importantly no $7-$8 charge.