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I'm not sure this is the right section, I apologize in advance. I'm from Italy, we recently had some issue using an italian SIM card (only-data SIM card, provider is WIND Tre) which is supposed to work off the shelf in roaming with AT&T in US. We used an industrial professional router (Digi IX20) and everything was working here in Italy, but then in US we got "No signal" and weren't able to use that at all. Router manufacturer claims that in order to work with US networks, the device IMEI has to be registered.. is that true? Why this don't apply to phones? Who take care of this registration?

EDIT

Router model is specifically this and roaming is enabled.

rok
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1 Answers1

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According to AT&T support their network supports the following LTE bands:

  • 700 MHz: Bands 12/17/29
  • 850 MHz: Band 5
  • 1900 MHz: Band 2
  • 1700 MHz/2100 MHz: Bands 4/66
  • 2300 MHz: Band 30

The Digi IX20 specifications page shows there are different variants and none supports all AT&T bands. It'll depends on the specific coverage in the region you're trying to use the router. Where the coverage is mainly 1700/2100MHz the the "M1" variant may work but without 3G fallback. For the 700MHz regions the "G4" and "N4" may work on one band only and dependent on availability and signal strength.

You need to contact AT&T and check which bands are available in the region you're trying to use the router.

EDIT: A special thanks to @DanielB for pointing out the right direction.

ChanganAuto
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