New Hidden Menu Option
If you dial 150 (or 07973 100 150) to talk to Orange Customer Services, wait for the call to be answered. You can then dial **#5 to listen to a 'hidden' menu that allows you to change your voice prompts. There are two English voices (Ruth and Tim), and what sounds like a variety of foreign language options. The final option, 9, allows you to record your own voice prompts for what seems to be the majority of prompts.