In my yallo under "Settings", you will find various cost checking options. Tip: To save costs, take advantage of our attractive add-on packages. These can be found in the "Roaming Cockpit" in my yallo.
If you deactivate mobile data, you can only surf the Internet over WLAN.
After deactivation, the use of mobile data, SMS/MMS, and calls will be blocked.
Data roaming in excess of options and included data
By deactivating, you will avoid paying for mobile data on the Internet once you have used up the options and included data you have signed up for. You can continue to use this as before.
090x numbers and Premium SMS
When this option is deactivated, premium rate numbers (hotlines or teleshops, etc.) can no longer be used.