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I found this article, a solo trip from Duri (in Riau, Sumatra) to Bima (in Sumbawa). He needed 2 months to complete the trip (to Bima and back). Itineraries included.
@AdrienBe I'm not asking people to call Indonesia otherwise, but to communicate their opinions well. I am fully aware that some regions are poor, as you've probably already seen. But to state outright, Indonesia is a poor country without explaining more, may give other people a false impression. Anyway, I hope you had a great time in Indonesia :)
@Madlozoz Yes, I know these facts well enough. I am an Indonesian. But still I think your answer is rather rude, esp. that part with the capital poor. You are free to state the facts, but please do it with respect. Furthermore, this question is about internet service and not medical care or whatsoever. I think stating that Indonesia is lacking in internet infrastructure would be enough. Just my two cents.