Some options:
1. Set a divert on the control.aa.net.uk page to send all calls to your mobile - You will be billed for the diverted call though.
2. Setup a VOIP app on your phone to register to A&A using the SIP credentials for your number. Look at Zoiper, 3CX etc
3. Make use of the A&A SIP2SIM service - Call and data pricing isn't great for this so you may want to use a handset with two SIM slots for this. You'll also not have access to your mobile number, unless yiu are using a second SIM
Aquiss FTTP BQM | AAISP VOIP | Ubiquiti UDM Pro | 2x Unifi AC-Lite & 1x AC-LR Wifi AP