How can I send a phone book entry via sms to another contact?
For example if I want to share the phone number of Mr A from the phone book and want to send it to Mr B via SMS how can I do that?
please help

NO, that would be via MMS, or Email, or PIN.
Not by SMS.

JS is correct rahularora. I know it can be done via BT, but the receivers phone needs to have the capability also (and also be within the BT range). With your phones using IR (one of the benefits of IR), you can exchange contacts or "business cards" that way.