Yes, you can open an online account with Upstox provided you have an Aadhaar linked mobile number.

For instance, if you have two mobile numbers under your name, and one of the number is linked with Aadhaar, you can use the other number which is not linked with Aadhaar to open your account. Only to complete the e-sign procedure you can use the OTP received on your Aadhaar linked mobile number.