Previously @davenc made Community aware of a Mobi beta opportunity:
Mobi is now ready to open up its cloud core beta to additional testers. For an annual payment of $50, one gets 5 GB of 4G/5G data then unlimited data throttled to 1.5 Mbps (much more generous than is typical with other providers). Hotspot is included.
This is intended to be data only service though depending upon phone, talk and text may work but are not currently supported. I expect talk and text would work on iPhone but not most Androids. There is no number porting. One would be assigned a random (probably Hawaiian - which is pretty cool) number.
Outside Hawaii, Mobi roams primarily on T-Mobile’s network though there is roaming on other smaller regional carriers as well. Mobi’s beta operates on its own network core, so Mobi’s roaming agreements are its own (no piggybacking off of TMO’s roaming agreements). If one has an eSIM capable phone, this might be an opportunity to add a second data network to one’s phone for a minimal investment.
The aforementioned roaming is domestic but there is also some international roaming. In particular, there is international roaming to Canada at no additional cost. I’ve learned here that @mwgardiner travels somewhat frequently to Canada. Possibly, this would be of interest?
More information is available at Mobi’s subreddit. I’m late posting this, so, if interested, one probably wants to act before year end. Here’s a direct link to the signup form: