Before you proceed, you need InTouchApp installed on your phone.
How to import contacts to InTouchApp :
Step 1 - Visit contacts.intouchapp.com and log in
Step 2 - Click on the drop-down arrow located on the top right corner beside the profile picture.
Step 3 - Select Import contacts option.
Step 4 - Click on Choose File button, then browse & select the file (csv, xls, xlsx, vcf).
Step 5 - Click on Upload button. Your contacts will be imported shortly.
(Note: If the Import file is not processed, please open the supported file formats and follow the same pattern)