When I had the One S I had this happen at random. I'm not sure if I remember the steps correctly, but just go to settings > mobile networks > and switch it from GSM only to WCDMA/GSM.
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When I had the One S I had this happen at random. I'm not sure if I remember the steps correctly, but just go to settings > mobile networks > and switch it from GSM only to WCDMA/GSM.