Originally Posted by
docbert
Given that US Mobile have dropped their $5 plan (cheapest now is $10 unless you want to sign up for a year), another option would be
https://hellomobile.com/ who have a $5 unlimited minutes/txt (including some interational), 500MB plan. I haven't tried them as I'm still grandfathered on the US Mobile $5 plan, but they are on T-Mobile so things should work pretty much exactly the same as the US Mobile GSM5G plans.
I just did a quick look at the Hello Mobile website - and see no reference to wifi calling. I believe wifi calling is a prerequisite for IMS to work.