Wi-Fi in my partment in Thailand is very slow?

My Wi-Fi in my apartment in Thailand is really slow. My thai friends, who have Thai iPhones and whatnot have no poblem conncting to the Wi-Fi and is really fast as a matter of fact. But when I try to connect with my American Laptop and iPhone, it either won't connect or is just really slow.

The router is a ZTE router, and the model number is ZXHN F620
Maybe there's some sort of setting I have to change on my laptop to adjust it to Asian Wi-Fi standards?

if anyone could help me i would very much so appreciate it: )

Are you sure it is the Wi-Fi that is slow?
Rather than the internet access?
Wi-Fi is between your pc and the router. The internet link is router to the WWW.

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