Hello friend, you can change your mobile no. by follow these steps

1. Go to career360 App. 

2. Click on three dashed line on the top of the left corner. 

3. Click on where your photo and signature is written. 

4. Then click on the 3 dors which is on the top of right side. 

5. Click on change the mobile no.   And enter new mobile no.  Then you got a OTP. By this your mobile no.  Will be changed. 

I hope this will help you.