The way the app tells you to pair it, is by using your phone number

It is a small link under where it asks you to input your phone number

And a European phone number is not recognized to verify your Gotenna

So long story short, if you are having problems sending messages using your phone number as the 'ID', try to re-'pair' your goTenna using the generated ID instead of getting one texted

The software cannot allow phone number other than USA default

Then after the Noah and their service department were kind enough to swap us for a different pair, we had the same exact problem!So as a last resort instead of trying to pair the goTenna's using our phone number, we noticed there is a way to do a random ID