Default Gprs

I have a Note 3 (sm-n9005, Android 4.3) and my service provider is T-Mobile (Hungary). According to T-Mobile customer service if the GPRS on the phone can't connect directly to a Satellite, the software sifts to the t-mobile which, of course, costs me money. Is there any way of stopping that from happening? T-Mobile will be delighted to sell me a package but it's expensive enough as is.

If you have an idea or suggestion, I'd appreciate your sharing.