MS Teams with Wireless carrier for Direct routing ?

Hi,

Yes, that is possible since they connect to Microsoft from their infrastructure. I cannot recommend any carrier but I would talk to the ones that act as both a wireless carrier and landline carrier. All of them I've been working with international assign a landline number to the user in Teams, but when they dial out their mobile number is shown, incoming calls are forwarded from mobile number to landline number in Teams.

I would recommend contacting the sales department for different carriers, and sometimes with new solutions as Teams it is easier to talk to the smaller carriers instead of the largest.