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ios – Green bubble SMS not working on strong WiFi with weak cell signal, iPhone 13 + Verizon

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I’m using iPhone 13 with iOS 16.3.1 and Verizon Wireless.

In my office, the WiFi signal is very strong, but cell signal is weak, i.e. between 0 and 1 bar most of the time.

From some googling, I understand that if I have “WiFi calling” turned on, it’s supposed to use WiFi to send green bubble SMS too. However, instead the green bubble messages I send are very flaky, i.e. they only get delivered like 1/3 of the time, and the other 2/3 of the time there’s a red (!) icon next to the green bubble, which says “not deliver”; I have to constantly toggle Airplane mode on and off to get the cell bars higher and then sometimes it works.

In contrast, blue bubble iMessages work fine. Also, when I’m outside on the street and I have five bars with 5G, green bubble SMS also work fine.

Am I doing something wrong in the “weak cell strong WiFi” case? Isn’t turning on “WiFi calling” supposed to make sending green bubble SMS texts just as quick and snappy since I’m on a strong WiFi connection?

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