[UK] T-mobile / Orange - Network auto switcher problem

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http://forum.xda-developers.com – I am not sure but is it possible to block my Note connecting to Orange? When I am on T-mobile I do get HSPA about 10+ Mbps and 3+ Mbps speed but orange hardly 20% of that speed. I end up having to manually switch network from Orange to T-mobile several times a day. Spoke to T-mobile customer service but of no avail. (HowTos)