>>zekyl3+0O
Those do exist, they’re called cell signal boosters. Once upon a time, I believe, some American cell providers would give you one for free if you had bad signal at home, which mattered a lot more before phones all had wifi calling.
>>superx+Os1
That shouldn't be the case. There's an extension to VoWiFi to support SMS over IP. With 2G and 3G going away it's not like your carrier has a choice anyway.