GetJar.com says that Opera mini is support by my mobile phone (my mobile phone is Motorola SLVR L6)... but when I try to install Opera Mini, it can't connect to the internet although I've granted it access.

What is the error ? DO I have to reinstall it or should I contact my service provider ??

I have a t-mobile mda vario II and opera mini works great on it... It should work on any mobile phone, so if I were you, I should contact your provider. I'm sure they know more.

I have no problem during using of Opera mini. You should contact service provider. You can ask it in Opera forums where you can find out your answer as soon as possible.

Opera mini is the only browser available for mobile phones. If firefox will release a mobile phone capable browser, I will definitely change to it in an instant.