It turned out that I couldn't use 4G to surf the net. All I could do was read Twitter. I went back to the shop and complained about this breach of contract. It turns out I didn't understand that "unlimited internet" meant "unlimited Facebook, Twitter, whatsapp, and Line". It didn't mean unlimited data.
I then spent the next 30 mins arguing with the shop person in a language that I'm rusty in, that no, I don't care about Whatsapp or Facebook or Instagram. I care that I can browse the web with a bloody browser, and connect to my machines via SSH, and no, what the plan promised was in NO WAY unlimited internet.
Still kinda pissed off over it