I'm very protective of my privacy so I've got my phone company to withhold my phone number automatically for all calls I make from my fixed line home phone, and one of the first things I do on getting a new mobile phone is to set it up similarly to block the sending of my cellphone number.
But sometimes I have to call friends who don't answer or automatically reject calls from anyone who's withheld their number, so I need to un-withhold my number just for those calls.
So just for ease of reference:
- 141 - dial before a telephone number to withhold your number (if it's not automatically withheld by arrangement with your phone network or through mobile phone setup) from the person receiving the call
- 1470 - dial before a phone number to send your number to the person you're calling (if they have caller ID on their phone), even if your number is usually automatically withheld
- 1471 - dial to check the number of the last person who called that phone (free in the UK for BT fixed lines). Alternative: *27# (undocumented but works for me - from the uk-telecom FAQ)
- 14713 - dial to return the call of the last person who called your phone (for a fee). Alternative: *28#