How to deal with a phone number field ?

["Kurt Kraut" <listas kurtkraut net>]

Hi,


I'm trying to build a personal contact database, with fields like Name, Address, E-mail, Phone Number, Cell phone etc. I'd like to allow only numbers to be typed in the 'Phone number' (to avoid typos and future incompatabilities)  field. Unfortunately, when I input phone numbers like '12345678' it is converted to '1.23457e+07'.

How can I avoid this behaviour ?


Thanks in advance,


Kurt Kraut