Wow. I'm just trying to think of the implications for this. For your land line, this isn't a problem since the identification source is that phone box outside your house. The signal is essentially on the same copper wire from the phone companies view point even if you have multiple phones.
For your cell phone, the source is the sim card for your phone. If there are multiple sim cards with the same number, which one will own the handshake with the cell tower on pickup? So could picking up the second cell phone interrupt the first cell phone's connection? Its just a broadcast so it can't be a dedicated airwave. Hundreds of other users will be on the same band so they probably chunk the data up like ip packets. So multiple receivers should be able to pick up the same data and translate.
I bet its a billing issue and not a technical issue. They can't figure out if there are multiple cell phones using the airwaves on the same account at the same time without a unique phone number/sim card combo. So they want to charge you if 2 people picked up for the same number, but they don't have that ability so they don't offer you that service.
Anybody who understands how cell packets work want to chime in? I'm just blindly guessing here.
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