Sure you can. That's one conveinence of having Vonage...you can take it with you. Once you become a Vonage subscriber, another option you may want to consider is Vonage Talk. If you're traveling with a laptop computer, you can download and install Vonage Talk to your computer and then you will be able to make and receive calls through your laptop computer...all you need is mic and headset. Keep in mind the quality of your calls made and received overseas will depend on the quality of your internet connection overseas be it if you use Vonage Talk or if you decide to take your Vonage adapter with you.
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