SMS for FaceTime - Domestic to Domestic iPhone in International Country

I have read numerous threads that indicate that an SMS is sent when communicating via FaceTime from a US number to an International Number, for both audio only and video sessions to activate the P2P session.  People are surprised when they get billed for an International SMS message for each FaceTime session they have.  So, for example if I was to use FaceTime to call a friend in UK, and my friend has a UK based iPhone, there is a "silent" SMS sent to activate the FaceTime P2P session and that SMS would have an international charge.
My question is, if you are FaceTime-ing a person who is physically located in the UK, however has a US based iPhone and you are in the US with a US iPhone, is there a "Silent SMS" message sent ?  For example, if my family was traveling on a cruise ship (with WiFi) and we wanted to have an audio conversation via FaceTime, (so we both have US Verizon iPhones), is there an international SMS sent ?
Thanks

Facetime only should send an international SMS Once to activate facetime. It should not send an SMS every time you use it as its done through WIFI.
From Ocean20...
Activation of imessage requires the ability to send a hidden sms to an apple server in the UK.  If your phone cannot send and international sms then you cannot activate imessage.
ACTIVATING FACETIME AND IMESSAGES
Activating Facetime and Imessages on your phone requires the ability to send SMS messages and depending upon where you are that might be an international SMS.  Check with your carrier to see if your plan supports sending of international SMS messages.  If you are having trouble activating Facetime or Imessages turn them both off on your device and reset the device (Hold down the Sleep/Wake button and the home button together until the apple logo appears (ignore the ON/OFF slider) then let both buttons go and wait for device to restart (no data will be lost)).  Wait for the device to restart and wait a minute and turn Facetime and imessage back on and wait for activation.  If that does not fix things read the following articles:
http://support.apple.com/kb/TS4268
Hope this helps

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