Read Me First, and other Important Items

Data has not been used for SMS since the Pixel 1, which uses IMS. The 2 and 3 both have constant SRLTE and use 1x for SMS instead. If wifi calling is enabled and set to preferred on the 3, it will use that for SMS over 1x (though MMS still needs LTE or CDMA). Likewise, if you force VoLTE on the 3, I THINK it uses IMS for SMS instead of 1x (it should), but I haven't been able to confirm that yet. Sent from my Pixel 3 XL using Tapatalk

No to mention the fact that Sprint has like 200 different SIMs. Never understood that. Their back end software must really suck.