Trying SIM in 4G mobile Wi-Fi device

IKBIKB Posts: 69FreedomPop Newbie
I use a mobile device normally with a 3 SIM and easily connect using 4G.

I tried with a F.POP SIM, it could only connect at 3G... also it showed FreedomPop (Roaming)

Q. Why show roaming? when used in UK. And why no connection using 4G?

Thanks

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