pre-paid phone & internet cards
Malaysia has a variety of telecommunication companies and phone & data service providers that offer pre-paid SIM cards:
Hotlink - the pre-paid service of Maxis
Xpax - the pre-paid service of Celcom
Tune Talk - virtual mobile operator, owned, among others, by Celcom and Tune, a company linked to Air Asia
XOX - mobile operator targeting the Chinese community
Personally, I use a Hotlink pre-paid. The calls and SMSs within Malaysia are rather expensive but the internet and calls to Europa are cheap. For a call to a landline number in Germany I only pay around 10cent (Ringgit). The coverage also seems to be quite good. The weekly internet plan is RM8 for 100MB or you can pay RM2 per day (also for 100MB). Be careful not to get beyond the data limit, then Hotlink will just suck your credit empty in no time.
Useful calling codes for Hotlink:
*122# - check balance
*139# - shows your phone number
*100# - gets you to the main menu, where you can select internet plans and others
All Telco Codes:
*122# - Check Balance
*100# - Main Menu (FREE)
*109# - Activate Voice Mail (FREE) #109# - Deactivate
*136# - Activate 3G service. *136*4# - Deactivate 3G
*138*6# - Activate IDD132 (FREE)
*117# - Activate Background music
*126*012XXXXXXX# - Call-Me-Back (FREE 3 times/month when no credit)
*139# - Check Your Mobile Number (FREE)
*135# - Activate PhoneBook Backup (RM2/month. Sync charges apply) #135# - Deactivate
*133# - Activate GPRS (RM10)
*131# - Activate Caller Ringtone (RM3/month) #131# - Deactivate.
*110*Number of days# - Activate Push-To-Talk (RM1/Day) #110# Deactivate.
**012XXXXXXX - Voice SMS (RM 0.10/30 Sec)
*111*14no. pin code# - To Top-Up/Reload
Maxis (Hotlink's mother company) stores in KL: www.hotlink.com.my/en/support/store-listing/outlet-listing.html
Internet Plans: www.hotlink.com.my/en/internet/mobile-internet-plans.html
Where can I buy SIM cards in Malaysia?
The SIM cards are sold at many convinience stores and stalls. They are very easy to find, just look for the logos below. Later, you can top-up your credit any pretty much any convinience store (7Eleven etc.).
When you arrived at KLIA you can also get your Malaysian sim cards right away. There are stalls of several providers just before you reach the customs (where you cue up to get your passport stamped).
Mobile Internet in Singapore
I recently I went to Singapore and was looking for pre-paid internet card and came across Star Hub.
Star Hub offers a pre-paid card with a internet option of 7S$ for 7 days with a data limit of 1GB!