I am traveling in Europe, unlocked two stock D2Gs in US, bought two Bouygues sim cards in France, tried to use in Austria under roaming, but... phone A calls phone B, phone B shows incoming call, when answered, no sound is heard on either phone. Same if phone B calls phone A. Calls to/from Austrian number has same problem, no sound is heard. Both A and B shows T-Mobile as roaming partner. SMS works without problem. Anyone seen similar problem ? Thanks in advance.