141 Does not withhold number on O2

Discussion in 'iPhone Tips, Help and Troubleshooting' started by Barry Scott, Dec 17, 2007.

  1. Barry Scott macrumors newbie

    Nov 20, 2007
    I called a colleagues work's mobile with my iPhone and the number had 141 in front of it.
    To my astonishment, my number came up on his display :eek:

    I wonder if the 'Show My Caller ID' completely overrules the prefix of 141?
    Mine is set to show - but it was on my previous phone - and typing 141 always used to withhold the number.

    Has anyone else come accross this issue?
  2. Barry Scott thread starter macrumors newbie

    Nov 20, 2007
    Eureka! I've just answered my own query - I saw another post which states the GSM standard allows you to type #31# before the number you wish to dial and it nicely withholds your number!

    I have just tried this and it worked a treat.
  3. splashtech macrumors regular

    Oct 25, 2007
    Great! Thanks for that! I've always had to go into the settings on my phone (T-Mobile/UK) to get that to work. 141 worked on my old Orange pay-as-you-go, but not on O2. I will try this now I think... :)
  4. Prince Charles macrumors newbie

    Dec 2, 2009
    Thank you so much for that! Been looking everywhere.

  5. nomad01 macrumors 68000


    Aug 1, 2005
    Birmingham, England
    Don't get it...

    Show My Caller ID is set to ON on my iphone.

    I've dialled a land line with 141 at the start and it's witholding my number as I'd expect it to.


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