In which module and tpl file I can delete the "call us" info and number phone that appear in the Header template I'm using?
Using Prestashop 1.6
Go to your themes-> your theme -> modules -> block contact -> nav.tpl edit this file.
There are two contact modules pre-installed
Contact information block (displays in the footer) and
Contact block (displays in the header) You just need to remove the phone number in the module
Contact block (leave the field empty)