You need to know the CLDC and MIDP versions for your Phone, there is no (huge) internal Table to get outdated.
Enter the info, choose from _several_ different types of connectivity (BT, WiFi, Pkt, etc.) to apply the speedup tweak to, then press activate.
I got a 25% speedup on my Wifi connection.
If you use the Internet for Business and have a Mobile Phone or Laptop this utility makes a lot of sense.
I don't know of (m)any other products for the Symbian OS that offer this Network Accelerator feature.
If you know your CLDC and MIDP versions then this is extremely easy to use and quite effective. If it doubled my speed I would be more enthusiastic.