Micro-free telephone use is the callback method, the following figure is micro will call back the principle, see understand also good explain the fee of the micro-meeting.
Free Phone fee details
There are two kinds of free telephone calls, one is the way of voice chatting, the other is the way of callback. The callback method does not need the flow and the telephone bill, the sign is after the call will prompt "The system is dialing back to your handset", if shows is "the micro-meeting voice calls ..." then needs to expend the traffic (WiFi network naturally does not need).
1. If the other party does not install or login micro-meeting, it will be through the "free Phone (callback)" Way to dial, the need to spend free time of gift, as long as you receive free money.
Note:
(1) Regardless of the foreign card or roaming, as long as the phone is free (global Qualcomm, Unicom 3G, and so have a province, the domestic no roaming package), then through the micro will make free calls are not to produce any fees. If you receive the money, you will be charged by the operator according to the roaming charges.
(2) If it is a foreign card or roaming, pay attention to whether the flow is in the province, the domestic general flow, such as you have only 100MB of traffic, but you roam outside the province, will be sent to call the call when the roaming flow, resulting in traffic costs.
2. If the other party has logged in, the default will be to use the form of voice chat in the app (equivalent to micro-letter real-time voice) without wasting free time, the other party to listen without paying, both will generate traffic.
Tip: Micro will not charge any fees, will only generate traffic.