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Tap on Menu.
Tap on the following in sequence
Settings More...
Now tap on Mobile networks.
Tap to deactivate the check box next to
Data enabled.
This will prevent data from being
transmitted over the mobile network. Later,
when you want to reactivate data services,
simply recheck the box.
6.3. Roaming
Some Internet flat rates only provide for a
limited volume of data traffic, if at all, when
abroad.
To avoid excessive costs for Internet use
abroad, please do the following:
Tap on Menu
Tap on the following in sequence
Settings More.
Now tap on Mobile networks.
Now tap on Data roaming.
Tap to deactivate the check box next to
Data Roaming.
This will prevent data from being
transmitted over the mobile network while
you are abroad. Later, when you want to
reactivate data services, simply recheck the
box.