@bigharj
I'm here to help! It sounds like you've done a great job setting up your UK geographic phone number on Twilio and integrating it with Vapi. Transferring a call should indeed be a basic function, and I'm sorry to hear you're experiencing difficulties.
To assist you better, I'll need a bit more information about how you've set up the call transfer in Vapi. Specifically, it would be helpful to know the following:
1. How you've configured the call transfer in the Vapi functions tab.
2. The code snippet or the method you're using to initiate the transfer.
If you could provide me with this information, I'll do my best to guide you through the process and resolve the issue you're facing. If there's any sensitive information, please make sure to redact it before sharing.