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联通 VoLTE 可短信开通了！
source link: https://www.v2ex.com/t/569653
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宽带症候群 - @citydog - 貌似是全国都可以了，本人河北用户，短信申请方式：发送 DGVoLTE 到 10010不过开通后，打电话还是会回落到 3G，HD 图标会消失，挂掉电话恢复，不知为何
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