So one of the issue with Prepaid is that somehow your credits will slowly stack up if your usage is lower than the amount that you reload(RM30/31 depending on the calendar month). So apart from the conventional ways like subscribing for a data plan, super long life, and credit transfer, here's some other ways to use your credit for things that you may not know of 

1. DiGi
Purchase App @ Google Play
Purchase App @ Apple Store
Purchase App @ Blackberry Store: http://new.digi.com.my/ecomm_C/services/de...Carrier_Billing
Steam Wallet (Codashop): https://www.codashop.com/my/steam-wallet-code-malaysia
Steam Wallet (Paypin, tested): https://www.paypin.my/deno.php?gateway_id=2&publisher_id=8
Mobile Legends (Codashop): https://www.codashop.com/my/mobile-legends
Heroes Evolved Tokens (Codashop): https://www.codashop.com/my/heroes-evolved-tokens
Skype Voucher (Codashop): https://www.codashop.com/my/skype-voucher
zGold MolPoints (MOL): http://www.mol.com/Reload/Faq/215

2. Tunetalk
Steam Wallet (Codeshop): http://codeshop-tt.com/
PSN (Codeshop): http://codeshop-tt.com/
Playstation Plus (Codeshop): http://codeshop-tt.com/

3. Hotlink
Purchase App @ Google Play
Purchase App @ Apple Store
Steam Wallet (Codashop): https://www.codashop.com/my/steam-wallet-code-malaysia
Mobile Legends (Codashop): https://www.codashop.com/my/mobile-legends
Heroes Evolved Tokens (Codashop): https://www.codashop.com/my/heroes-evolved-tokens
Skype Voucher (Codashop): https://www.codashop.com/my/skype-voucher
zGold MolPoints (MOL): http://www.mol.com/Reload/Faq/215

4. Celcom
Purchase App @ Google Play
Purchase App @ Apple Store
Steam Wallet (Celcom): https://www.celcom.com.my/personal/services/steamwallet
Steam Wallet (Codashop): https://www.codashop.com/my/steam-wallet-code-malaysia
Mobile Legends (Codashop): https://www.codashop.com/my/mobile-legends
Heroes Evolved Tokens (Codashop): https://www.codashop.com/my/heroes-evolved-tokens
Skype Voucher (Codashop): https://www.codashop.com/my/skype-voucher
zGold MolPoints (MOL): http://www.mol.com/Reload/Faq/215

5. XOX
Steam Wallet (xoxfun): http://steamwallet.xoxfun.com/

6. UMobile
Purchase App @ Google Play
Purchase App @ Apple Store
Steam Wallet (Paypin): https://www.paypin.my/deno.php?publisher_id=1&gateway_id=1
MOL (Mol): https://www.u.com.my/extras/apps-services/game-credits
zGold MolPoints (MOL, not sure if same as above): http://www.mol.com/Reload/Faq/215

Archived as of 2018-01-22