Thank you to OP for sharing the hack in this thread.
The hack is 'very effective' with my Motorola RAZR XT910 (broken), because the 'novj' option is being forced by default in it's system.
Now I am using Sony Xperia Z1 (C6903), and I got the same speed (in H+ (HSDPA+ mode)). as the XT910 with the hack, DL:6Mps, UL:1.5 Mbps
As OP and I said in previous threads, this hack does NOT GUARANTEE any network link speed improvements. If you get better speed, then congratulation.
Current: Motorola RAZR XT910, PHAsia (SEAOP), rooted stock.
Tablet: Nexus 7 (16GB) Vanilla stock,.
Was: Google Nexus One, boot unlocked + rooted, Asus Transformer TF101