Support 3g/H+ but no internet

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http://androidforums.com – Samsung Galaxy S3 on orange. Had phone a few weeks, then started getting "Can't connect to server (Hotmail)" coming up near the bottom. Then realised my 3g wasn't great but was workable. Went to london, my mate has same phone on orange and he was getting full 3g/H+ internet, facebook app working etc. Mine had nothing all weekend! Showed H+ but internet loaded only text no images, and facebook said "can't connect to a secure connection" or something similar. It's really tempremental and v.frustrating! So yea, restart phone don't help, toggle air plane mode don't help. (General)