I chose LG u+ as it was recommended on forum as the cheapest and value for money.
Lg allows wifi hot spot for up to 10 users. Therefore, is good if there is a group of friends travelling together.
Some of the other operators only allowed up to 3 users.
LG u+ cost 8000 won per day and 5000 won per day for rental of more than 5 days.
Wifi egg is card size but thicker, maybe 0.5cm? Quite compact.
REntal at 1st floor : Arrival Hall between gate 9 and 10 ( 0600-2200) or between gate 5 and 6 (24 hours)
Return 3rd floor: Departure Hall Counter AB, E, F and M.
Other wifi egg rental operators, prices range from 8000 won onwards and discount are usually given for long term rental. However, there is a need to make a reservation online. They are at the arrival hall too.
kt rental olleh
Operators above also provide phone rental for those who prefer a private 3g service. You do not need to request your friend to switch on the wifi hotspot everytime you need to use.
The price of other companies can be cheaper.
There was a promotion from mid May to end June 2013 which make other operators relatively cheaper. However, I did not see this information on their website and Korean Tourism board only posted it online at around end of May. I had already rented wifi egg from LG.
For some operators, prices quote does not include the 10% vat tax. A 200000-300000 won deposit is needed for rental. You can use your credit card to pay the deposit.
The wifi egg charges with the mini usb cable. The charger provided can be used to charge most of samsung and htc phone. Battery life around 6-8 hours for the wifi egg. To me, it is more than enough as I do not like to spend too much time online when I am travelling. Just for research, on train rides and replying to important messages and mails.
There is another operator , Evergreen, is a prepaid sim service with 3g internet. I was interested in renting this at first as it is the cheapest.
However, the shop only opened at 7/8am and I had to catch a train to Yeosu.
You have to bring an extra hp for the korean sim if you do not want to miss any calls from your singapore sim. I am not sure about wifi hotspot for the phone.
evergreen is also quite active on facebook. You can message them in English and they reply to questions in English.
You can now order evergreen sim online and pick up at various location including at seoul airport for free.
If you are following a package tour and have no time to pick it up, they can mail it to your singapore address but at a cost. The sim and the shipping will add up to around $50. Nano sim will cost slightly more.
Shipping is fast, takes around 2-3 working days.
Make sure you are able to access the internet before leaving the counter. It is harder to find help outside the airport. and take down the number of the customer helpline.
If you are just travelling in Seoul, internet is available at cafe and hotel. It may not be necessary to rent a wifi egg. However, is good for doing researching and surfing the net on long train journey or when you are lost. At restuarants and cafes with password, just ask them for it. They are quite willing to provide customers with the password.