There are, of course, legal privacy obligations around recording calls,

particularly depending on what you subsequently do with the recordings.

Twilio explicitly flags this in its recording documentation.

This could actually be a really elegant iPhone setup.

You'd have SIM 1, SIM 2, number your normal mobile, essentially irrelevant.

Data not needed.

Normal personal calls, possibly.

Business incoming.

Twilio forwards here.

Here, incoming caller ID, original caller, business outgoing, call Twilio, dis A,

presented number, your 0114 number, recording, Twilio, Twilio.

And because both are genuine cellular calls,

you get native iPhone phone UI, Bluetooth car integration,

excellent reliability, and no ground wire SIP push dependency.

The only slightly inelegant bit is outgoing dialing.

Instead of tapping John,