You can’t open an online account if your mobile number is not linked to your Aadhar card. Aadhar card is required not only for your address proof but also to make your process hassle-free. We prefill some verified information using the UIDAI database.  

Linking a phone number makes your life easier in many ways, including account opening with Arihant. Why don’t you do it right away? Read here for more details.