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Why should the telecom card of Xiaomi phone watch be opened?
The telecom card of Xiaomi phone watch should be opened for the following reasons.
1. If there is no local network above 4G, there will be a situation that the telecom card is not registered with VoLTE and the call service cannot be used.
2. The chip in Xiaomi mobile phone watch does not support CDMA 1X, EVDO. They are all calls of 4G full netcom, so you need to take the 4G network channel and use the telecom card to open VoLTE.
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