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I've recently purchased a RUT240 and a Cricket (AT&T) SIM. I'm in town with a reasonable signal. My phone in the same location has AT&T 4G LTE service and has decent download speed. I've tried forcing it to use 3G in the network settings but it will only use 4G LTE. I see the RSRP is bad. Any suggestions on what to try?

FW ver.: RUT2XX_R_00.01.12.2

Sim card state Ready
Signal strength -67 dBm
Cell ID 98070552
RSRP -101 dBm
RSRQ -11 dB
SINR 4.7 dB
Operator AT&T
Operator state Registered (home)
Connection type 4G (LTE)
Connected band LTE BAND 4

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Now that I have managed to connect 3G, I can get somewhat better performance but looking at the log it keeps connecting and disconnecting. What could cause this?

image Date image Action image Result image
402 2020-06-19 15:19:53 Mobile Data Mobile data connected, IP: 10.115.45.91 AT&T
401 2020-06-19 15:19:37 Network Type Joined 3G WCDMA
400 2020-06-19 15:19:33 Mobile Data Mobile data disconnected
399 2020-06-19 15:14:50 Mobile Data Mobile data connected, IP: 10.114.240.242 AT&T
398 2020-06-19 15:14:28 Network Type Joined 3G WCDMA
397 2020-06-19 15:14:24 Mobile Data Mobile data disconnected
396 2020-06-19 15:09:34 Mobile Data Mobile data connected, IP: 10.114.181.68 AT&T
395 2020-06-19 15:09:17 Network Type Joined 3G WCDMA
394 2020-06-19 15:09:15 Mobile Data Mobile data disconnected
393 2020-06-19 15:04:25 Mobile Data Mobile data connected, IP: 10.3.153.106 AT&T

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I've now tried this in 3 locations and the results are the same. The download/upload rates are between 0.01 and 0.1 Mbs. If no one has any more ideas I'll need to send this back. Its sad because I want it to work.

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Try to follow some tips from this page at first https://wiki.teltonika-networks.com/view/LTE_Speed_Discrepancies

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Yep looked at that. Not talking about reaching maximum speed. I'm getting between 0.1 and 0.01 MBs. Something is seriously wrong. I managed to get it try both LTE bands on the tower half mile away and I somehow managed to get it to connect to 3G and the results are similar, not usable. Is there a way to tell if this is a modem or carrier issue?
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The signal (SINR, RSRQ ...) as reported by the modem looks barely usable if at all. Can you check that your phone and the modem see the same cell ?
Have you tried another location for the antennas ? With one vertical and one horizontal ?
I had a similar issue (three cell towers in the same area, lots of interference poor SINR) and ended with two Yagi antennas now I am close the maximum possible in term of signal quality.