I am using magento 1.9.1 but it seems that magento do not have strong validation at all !! eg. ph no accepts letters too...same with pin no. etc. i also want to remove fax and company option which is useless...do any one knows what is exact problem ???
You can modify the existing validation to what ever you want. Are you talking about codebased changes or GUI chagnes?
Step 1: Click on below link for phone number and pin code validation solution please follow the steps mentioned in link.
Step 2: Click on blow link to remove filed form address filed.
Hope this helps you.