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Hello there! 

I'm trying to use TRM250 but it seems that connection is very slow... When I use Huawei e3372 it's very fast ! 

I'm using the modem in Switzerland with correct COPS. 

AT+QNWINFO = CAT-M1, 22801, LTE BADN = 6300 OK

Regarding to https://wiki.teltonika-networks.com/view/LTE_Speed_Discrepancies

What is the best LTE Category I can have with TRM250 ?

Is TRM240 better ?

Any idea ?

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TRM250 is in CAT M1 category. Cat 1 limits download speeds to 10 megabits per second and limits upload speeds to 5 megabits per second. Cat M1 caps both at 1 megabit per second. 

Also, TRM240 is in CAT 1 category, which would not result in much better speed.