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  • 1
    What about phone numbers expressed with letters, e.g., 0800DIALTHIS? Commented May 9, 2011 at 9:37
  • 3
    What are you trying to prevent? The user lying? The user not wanting you to know their number? The user being too lazy to enter anything? The user doing a typo? Commented May 9, 2011 at 12:25
  • @ mouviviel : yes that also i need to think about i am taking one valdation scenario at a time so i will think about it. Commented May 10, 2011 at 5:44
  • @Benjol : This application is a commercial one so we can't risk on our coustomers i know a user will enter a correct number but what if he/She does not. Valdation are pretty important as they save application not only typos. I don't want my DB to filled with useless junk. Commented May 10, 2011 at 5:47
  • 5
    well what are you doing to validate their email addresses? You'll observe that nearly all websites do "real life" validation (i.e. sending you a mail). I think that if the phone number is that important, you'd need to do something equivalent. Commented May 10, 2011 at 7:05