Yes, in order to receive or make a call (while you are abroad) you need to have enough credit (THB) in your TRAVEL SIM.The TRAVEL SIM default does not have any credit. You will need to top up before you travel to make and receive call.
Receiving SMS is free of charge while roaming abroad. So you do not need to have credit. Sending SMS is not free of charge, therefore you will need enough credits to send a message.
IOS: APN is automatically set up
Android : Setting => Wireless and network => Mobile Network => Access Point Name => New APN => please input value as follows:
Travel SIM Topup Packages
- TRAVEL SIM Asia 1 GB 3 days (150 THB) : USSD : *115*150#
- TRAVEL SIM World 1 GB 3 days (300 THB) : USSD : *115*300#
- TRAVEL SIM Asia Non-Stop 4 GB 8 days (299 THB) : USSD : *115*299#
- TRAVEL SIM World Non-Stop 4 GB 15 days (799 THB) : USSD : *115*799#