Max-HD4 not connecting to more than one cellular source

Hello all,

I have a bit of a strange problem with a Max-HD4 unit.

I have two SIM cards from different companies (AIS & Dtac, Thailand).

Both SIM cards will work when installed independently in any of the four primary SIM card slots. but, when both SIM cards are in the unit at the same time, only one will connect and the other remains in the “obtaining IP address” stage indefinitely.

I have a third SIM card, again from AIS, I have just having the two AIS cards in there, but again only one will connect.

All settings are set to AUTO, and I have tried entering the published APN details but the problem persists.

All cellular connections are priority one.

Any help would be greatly appreciated, I have a good understanding of this type of equipment but I’m relatively new to using Peplink products.

Many Thanks,
Matt

Dtac in Thailand check signal from ISP. Cellular Bandwidth not good.
AIS/Dtac/True APN can auto no problem.But TOT is custom APN.

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