I have repeated issues with calls from China to the U.S. Ill initiate the call, Ill hear the party answer and then it goes silent on my end, sometimes both ends. The call is not cut off, but at the very least I cant hear them. Sometimes I get 20 seconds before it happens. Ive talked to Truphone customer service...they apologize, but apparently do nothing about it because its been happening for at least 2 years. They wont admit that it is happening and tell me to reboot my phone or its a bad wifi area. No, thats not it. It works ok in other countries back to the U.S., but not good in mainland China.