Best practice international GSM setup

[MBK]

Originally Posted by dg7feq

wouldnt it be easy to do this if you have a VoIP enabled PBX box at home (e.g AVM Fritz!Box which is basically the standard router here in germany from all telco providers)?
I have set parallel calling on my landline number - so calling my landline rings our normal phone and two cellphones. first pickup gets the call.
With this function i also forward my calls to our XXSim and ToggleMobile if needed and can pick my provider as i wish...

Yes, but this way you are depending on your home Internet connection.

Home connections are less reliable than the providers using datacenters, so when your router is offline or not reachable you calls won't go through.