Im using an unlocked ATT 3gs with my carrier in Argentina (Claro). Visual voice mail presents the caller number incorrectly, it adds the + symbol before the areacode instead of before the country code (which is not sent or not shown) take a look at the pic:
Phones should be formated 11 xxxx yyyy (our country code is 54) So when the + symbol is added it appears as an incorrectly formated USA number. My contacts phone numbers are stored using 11XXXXYYYY format
Called many times the carrier but they solved nothing to date.
Any ideas? Thanks!