Mint Mobile uses the t Mobile Network. And they have a 7 day trial sim at Best buy for like 2 bucks you could just do two of those since you probably don’t care about having the same phone number for both weeks. The bandwidth is limited though. Or you could get a month off unlimited for like 45 bucks.
I don’t think this is true for all of them. My cube takes at least a couple hundred rotations and then you have to take the stickers off and move them around to solve it.
I use it all over the western half of the USA. I’d say maybe 10-15 percent of locations where I have signal the actual speeds are abysmal. I think due to the mvno data being deprioritized but I can’t say for sure. I still keep them because it’s cheap but it can get annoying