Is it compulsory to mention telephone numbers/ email id on Form 49A?
A29 Telephone number is not compulsory but if provided it may help in faster communication. When the telephone number is mentioned it is necessary to mention the STD code. In case of mobile number country code should be mentioned as STD code. When the telephone is provided by WLL service providers the STD code should be mentioned. If email id is mentioned PAN will be communicated on email id when it is allotted by the Income Tax Department.[Source : http://incometaxindia.gov.