Radxa 5b+ as backup wan through sim card

#1

Hi I am using radxa 5b+, what I would like to achieve with it is to use it as backup WAN modem for my unifi using sim card.

I have two questions:

  1. Is it possible to work as a modem and pass internet traffic to the unifi cloud gateway.

  2. If above is possible, is following modem ok to use?

https://uk.rs-online.com/web/p/rf-modules/2069154?gb=s

#2
  1. You can do anything that you can do with standard linux networking, you can infact use it as a WAN without problems.
  2. This doesn’t work because it’s a miniPCIe modem. You need an m.2 modem that can work in USB mode.
#3

Thank you very much, I didn’t even notice it is a miniPCIe, but looks like some M.2 modems doesn’t support usb mode so I nees to look for the right one, thanks!

#4

Could you help me with one thing, you have mentioned that the previous one I linked use wrong interface(PCIE), as I managed to get it for free I am thinking, is there a chance that it might work through adapter from mini PCIE to M.2? At the end of the day it is usb modem according to the description.

I found following one, two versions with sim or without, if I decide to one of them, which one should I choose?

https://www.amazon.co.uk/Ghnbajzls-NGFF-Mini-Adapter-Module-Green/dp/B0DB4PGGDP/ref=sr_1_12?crid=212QN0NDQU4JS&dib=eyJ2IjoiMSJ9.89B2CHaYwTCxsIfVfMzXcZBXJ7Vi5mzYoSnlJ8YadtI7qqkM5SBqU4xyuDQTKoWOG6D5rwRrncA1CfdRNf-qb4wpCq4NI635hpSzG18EncCziNGarbjOgEqMBOBVG234koTqjCg5XyspqSyhhdJIhbLjhI573D-F_GGUjhrILSVw0tYqq1Hu5G-rtww9wIwNxae1G6eSYVoN8vZFFaQSdaBnp-UeR9FezOc4r8kiaUbbEzLiA4TyYI5ADas98WswA4e6-_XjG19E7nh1thaJXPhKSsIhE8VBZdUdY9d0xic.fZwZnN8cQpSJ0WeSLlozgp5xFBRGNfqq_0vsy1pcvME&dib_tag=se&keywords=M.2%2BNGFF%2Bto%2BMini%2BPCI-E&qid=1752044510&s=electronics&sprefix=m.2%2Bngff%2Bto%2Bmini%2Bpci-e%2Celectronics%2C151&sr=1-12&th=1

There is also something like that:

Not a perfect, but still saves me a lot of money as typical modem costs roughly £50, there are some cheap HP modems but I hear that they might not work with non HP hardware.

#5

The whole freq range of regions/networks supported is another but 4G…
https://www.amazon.co.uk/Network-Accurate-Stable-Laptop-Desktop/dp/B0C3VLG95K/ref

#6

I’ve bought another card: Sierra Wireless AirPrime EM7455 - and it does work well!