Hi my Z10 has been on 3G HSDPA. and browser is fast, loads pages Quickly, today my network has 3G+/ Dual Channel HSDPA. with speeds in
theory of 42 Mbps download, old system 3Mbps at best, now 12/14 Mbps could be higher, the Z10 browser is like a rocket and loads in moments,
its faster than normal internet in my area, and it plays live tv without breaks and the screen is very good and just right size, Blackberry was
right to keep flash player support, a great phone, bonus is having moved to faster system i have unlimited data ( no cap or extra charge ).
my network 3UK is only one in UK to go the 3G+ DC route and the 4G will only be a little faster in real world use, as the upgrade cost very little compared
to 4G, it is included in price plan at no cost,
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and enjoy using your BlackBerry!
my post if it has helped you. Much appreciated! 
