I recently signed up for Sunrocket based on their feature set, Annual Deal for $199 and no activation/cancellation fees. I didn't really look into Call Vantage but preferred it over Vonage because of the activation/cancellation and deal. I have not used it abroad yet but read some reviews that have said it worked well, the hardware is small enough to easily fit into a suitcase during travel and I look forward to trying it soon. Good luck!