Internet Access

I have a SE Z550i and have activated Spice Simply Download scheme which actually allows me access only to Spice homepage. But i managed to overcome that by installing Opera Mini Browser. It managed to connect to internet and i can open all websites. But many other applications that i downloaded for my mobile and installed failed to connect to internet.
Cud anyone tell me why Opera Mini can connect to internet but other applications cannot?

maybe you have to meet some configurations for services except http browsing