There was a posting about the charges before
setting off to the TT!!!
I decided to just use text messages and found it
to be 16p instead of UK price of 10p, which wasn't bad.
I made one call while on the island which lasted
2min 40 sec and costed 40p plus vat, same for
one incoming call.
I to am on o2.
It seems crazy why its classed as international
and part of British Isles!