Data plans that will work with the XE 300 Puli?

I use this device for my job. Sometimes I use a few GB’s of data a month and other times I use 50-100 GB. Therefor, it doesn’t make sense to pay more than I actually need with a prepaid or postpaid plan which have data limitations. What I don’t get is that both T-Mobile or AT&T have an unlimited data plan for normal smartphones, but not for hotspot data. How do these carriers know if the sim card is being inserted into a hotspot device vs a smart phone?

You can try setting the TTL to 65 in manual Settings.