I would be staying at Genting SkyWorlds Hotel. Do I need to bring any modem or router along? Around 15 people would be using WiFi.
15 people? single router? pitiful speed.. 3Mbps divided by 15.. speed in kbps? back to old 1990s speed per person. Even using 3 MiFi separate devices barely enough for a stable lag-free speed.
First you must understand something about hotspot sharing using Malaysia telco.
Most big names Telco does not support hotspot via non-phone device.
XOX bochup.. good for hotspot device, downside, max 3Mbps.
Maxis Hotlink 6Mpbs only 40/48 plan support hotspot unlimited, downside, max 100GB.
CelcomDigi (12Mbps) you need to buy add-on hotspot 20GB extra ontop of original prepaid plan.
20GB too little, but OpenWRT hack save the day, ignore hotspot data limit, use main data limits (which is unlimited)
U-mobile claimed to have unlimited plan, but insert sim to mifi. it cannot connect to internet.
It is IMEI white-listing. it allow only phones and tablets, not CPE (aka mobile routers).
What are the factors in Telco define as hotspot?
As long it had additional hop before outgoing to internet, they are considered hotspot data,
TTL value increase when it hop to a new connection, by the time the request return back to Telco, they will inspect the hop count.
ISP (64) - phone sim (65) - ISP (66)
ISP (64) - phone1 sim (65) - phone2 connected to phone1 hotspot (66) - phone1 (67) - ISP (68)
ISP (64) - your MiFi router (65) - phone wifi (66) - MiFi router (67) - ISP (68)
Some router with OpenWRT firmware can modify the hop count, to fool telco, as single hop.
(Before returning to ISP, set the TTL to 65, the ISP will get TTL value of 66, and consider it as non-hotspot.)
The term to your DIY research on is TTL (Time to Live), also search iptable mangle postrouting
I am using GL-inet routers which use OpenWRT firmware by default.