Remove roaming R with MVNO on home network for Jelly Bean ??

Since I am on UPC HU, a MVNO (Mobile Virtual Network Operator) on the Vodafone network here in the Hungary, I need to switch roaming on to be able to use data and next to it I constantly see an small R next to my signal bars.

How do I get rid of the roaming signal within the country?
Thx

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