Default 4g otg dongle with nexus 7

Greetings fellow XDA members! I was wondering if any of you would know how using a an LTE otg dongle on my grouper would work on T-Mobile. My question is whether it would show up as a tablet as it is, or something different like a hotspot/modem/phone/something else. I'm asking because I plan to use their 200 free MB of data for TABLETS because it's free so why not

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