We have the same issue with Iphones - WIFI calling does not work at all. Download of pics and messages is stopped or slowed down if the phone is connected to WIFI. As for the suggestion of Voice over IP - we have it - does not work well either. Have an ongoing trouble ticket with them over dropped calls and garbled connections on numerous occassions. Sometimes works flawlessly, sometimes not, no rhyme or reason to when it does not work.
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