IOS update removes the current settings in 'Cellular Data Network'
When I updates the IOS of my iPhone, I have to enter the 'Cellular Data Network' again, because they are overwritten by my previous (original) telephone provider.
The iPhone has been bought at T-Mobile in the Netherlands. I have moved to Germany and using this iPhone now with a German provider.
The iPhone sim-free.
Every time I update the IOS of this iPhone is updated, the Cellular Data is overwritten by the original T-Mobile settings.
How can I change this very annoying behaviour/setting?
Thx
iPhone 4, iOS 6.1.4, HaFr Germany