This tutorial shows how to edit Call us… section in header in OpenCart 1.5.x:
Connect to your server via FTP (TotalCommander, FileZilla) or via hosting cPanel and navigate to vqmod/xml/tm_header.xml.
Back up the file by saving a copy on your computer.
Open the file with any code editor (online, DreamWeaver, Notepad++, Sublime, etc.):
Search for the Call us text with help of Ctrl+F keyboard combination, edit the text and Save the changes:
To edit the telephone displayed in header, log into the admin panel and navigate to System > Settings > Edit your site > General > Telephone field, change the phone number and Save the changes:
Feel free to check the detailed video tutorial below: