As a second position of Opera Mini worldwide users, I think Opera must have proxy server here in Indonesia.
Indonesia has its own internet line called IIX (indonesia internet exchange) as internet backbone. Servers that are located in IiX server will be fast if it's accessed from within Indonesia area. Unfortunately, they're damn slow when they're accessed from other countries.
Some friends of mine have complained about how slow their website when it's accessed using Opera Mini, and it's because the server is located in Indonesia.
Opera Mini will retrieve data using proxy server in Norway and US. If I use Opera Mini to access my website that's located in IIX server, it means that I access my own website from US/Norway before it's delivered into my cellphone later.
With the availability of Opera's proxy server in Indonesia, Opera Mini users from Indonesia will be able to access their local website easily.
I think Opera can get partner to develop proxy server in Indonesia easily. Indonesia is a great developing country with many great local contents.