Step 1:Transfer the import file from your computer to your iPhone in iTunes.
1. Connect the iPhone to your computer and go to the File Sharing section in iTunes.
2. Click the Add… button, locate the file you want to transfer and click Choose.
To delete documents from iTunes’ File Sharing list, select the name of the document and hit the Delete key on your computer’s keyboard.
When done, you can disconnect the iPhone from the computer.
Step 2: Launch ExcelContacts app and tap start button in import screen.
Step 3:Select the "USB" import option.
Step 4: Select a file for importing in File Sharing list.
Step 5: The app will ask you to confirm, you can tap the Import button to continue or tap the Cancel button to exit.
Step 6: Wait until the app finish the import, there is a progress bar during the import.