How to disable the SMS security for GMAIL

Turning off 2-step verification

 

Did your email client or applications stop working when you turned on 2-step verification? Don't fret -- you can get applications and devices that need access to your Google Account working again in minutes using application-specific passwords.

Turning off 2-step verification

1. Visit the Using 2-step verification page under your Google Account settings. Sign in with your username, password, and verification code if prompted.
2. Click Turn off 2-step verification.
3. A pop-up window will appear to confirm that you want to turn off 2-step verification. Click OK.

Ref: Google Support