I've got my Mate 20 Pro a few days back with preorder and I have 2 SIMs that I use and have used in my P20 Pro too: one O2 SIM and one Three SIM, but sadly, the Mate 20 Pro doesn't seem to recognize the fact that it has a second SIM in the NM tray.
I've swapped SIMs between them, and the sim1 tray can use either of the SIMs, O2 and Three, but the NM tray cannot seem to work with either of them.
Both carriers are official Huawei providers and pre-order partners, so there is no incompatibility issue.
As much as I like the phone, I do need both networks to work, so is there anything I can do to get it fixed?
Does the Mate 20 Pro support wi-Fi calling? And if does, how can I enable it?
How can I use the the SIM Toolkit, as I get *SIM toolkit is not available on this SIM card*?
Best answer by chillphone
The UK model is single sim only.
O2 does not currently support wifi calling on the mate 10 or 20 unfortunately.
I'm looking at moving to three for this reason.