Apparently YES is a giant metro network, with access points all over their coverage area, thus no sim card needed. Just need to set up the account. I found this post below in the broadband forums. Explains it all quite nicely.
QUOTE
Hi, I'm 1 of the rf engineer who working on this project currently.
I might able to answer some questions regarding to the technology and radio frequency things.
Simply speaking, YES WiMAX is just a very advance version of wifi.
For WiFi, we connect via a nearby router which cover a short distance.
For WiMax, we connect via a nearby base station which cover up to few KMs (0.5-2km) in urban area.
WiMAX is not really from a telecommunication world which using telecommunication technology, but instead it is from computer world which using computer technology like data networking.
So due to it is from IEEE standard and from computer world, it just same like other WiFi, u connect to WiFI by just provide security keys, but in WiMAX u provide user ID and password to verification to access the service, ur user database is saved in YES server, the server will translate ur user ID and "so called" phone number actually is the same thing. In WiMAX, everything is data and digital, as simple as "WiFi" and "Internet".
While different from telecommunication technology CDMA GSM HSPA+ and LTE coming malaysia in next 2 years, these technologies are from telecommunication world 3GPP standard. For Voice Call, current common operators still using 2G technology, just the data service is 3G technology. For 2G technology, it is still more an analog system which actually no database on server for verification when ur handphone connect to base station, instead the SIM card is the only thing to identify ur device.
So you know why it doesn't need SIM card for WiMAX.
Why past days don't use data networking for voice call? because data rate before (even 3G) is still not enough to maintain a good quality call, with nowadays data rate can up to 50mbps, it is a good idea to make call using data networking, because traditional telecommunication technology using mostly on analog and require a lot of hardwares to maintain the system, while data networking require much lesser hardwares (save cost) and easy to maintain... cause only need... softwares!! upgrade to maintain (save cost). Anyway, voice call over data networking is not easy, as data is something easy to lost over a long distance data transmission, so the voice call quality cant compare to traditional technology.
Added on June 22, 2011, 8:49 pmMobile Broadband can't compare with Fixed line Broadband at all in terms of stability.
Just like how we compare Laptops and Desktops.
For mobile broadband, it have a much much more technically difficulties to fully cover and make sure an area to have a very good signal.
Especially WiMAX in Malaysia and most countries which operates at high frequency 2.3Ghz spectrum.
High frequency = shorter cover distance per each base station (or antenna in easy term)
High frequency = lower wall/building penetration power (this is why indoor signal is very weak)
For WiMAX need approximately 3-5 more base stations to cover an area compare to a normal GSM Base station.
Just like how you try use 3-5 one cent syilings to cover a 50 cents syiling, if u use 3 to cover, u find out 1 small hole in middle, when u use another 1 cent syiling put on top to cover the hole, u probably overlapping the other 3 syillings, (overlap = interference = drop in signal quality). More complex to say... it also include the capacity and frequency plannings... depend on the populations density of the area.
So... it is very sorry if your house is in the hole area, or in the overlapping area, u cant get the full signal. It is all depend on luck
Technically, if you are on best-spot, it can be achieve as high as 20mbps DL speed for current device limitations, but i think now average for 10mbps is good enough for everything except download.
Added on June 22, 2011, 9:24 pmYES Life
YES life is just an application on iOS device.
First, let us separate 2 things,
1: Application - What you have been interacting with your phone.
2: Data Transfer - What have been sent out / receive from internet.
1. YES Life is only an application, which allow you to make voice call / face time on internet instead of using GSM from Maxis/Digi/Celcom.
2. How? By transfer the voice over internet, what connection u use for internet? it is either WiFi that you connected or Data Plan that you submitted from Maxis/Digi/Celcom.
What are the advantages?
1 - You can have 2 numbers from your iPhone exist TOGETHER, 1 number from your SIM card, 1 number from your YES ID.
2- You can call to friend with only 9 cents / minute using YES ID, especially good if you make IDD call from other country.
3- You can do a face 2 face call.
This post has been edited by Something Else: Jun 28 2011, 04:21 PM