Hardware: Mobile phone bypass -> Fixed net

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Hello of people!

I have a o2-Genion contract. I would use gladly the Homezone, even if I straight at home am not.

I thought there of the following: I leave the SIM map in Homezone and connect somehow with a computer. All detailed calls are accepted from now on by the computer and the computers call another fixed net number however at the same time.

Do you mean that such a thing can be realized? Goes only with the computer, or would be possible also more particularly rout?

Greeting,
kewes

P.S. I have the fear the fact that I am not first which asks. But I found nix, which addresses the problem somehow.