Mustafa Phone card is a prepaid calling card owned by NTT.
You can use this mustafa calling card to make international call from Singapore to :

Mustafa prepaid card feature:

• Crystal Clear IDD quality
• No Connection Charge
• PINless Dialilng (Registration or Topup)
  Customer Care Line: 64190702

Dialling instruction

1. Dial 68239650
2. Press 2 for Speed Dial
3. Press 1 for new speed Dial
4. Select Spead Dial Number+# key. Eg. 1+#
5. Enter Destination Number+# Eg. 919123456789+#
6. Speed Dial is set
7. To Call using Speed Dial: Dial 68260790 then press speak dial number for the destination.+# key.