How can I check pay as you go balance or expiry date while in using prepaid ANNEX Korea SIM Cards?


Please follow the steps below in order to check credit balance or expiry date 
 while in using prepaid ANNEX SIM FREE A and B, ANNEX SIM BASIC and PLUS.

Try to use top-up App as following. 

  • Step 1. Download the ‘WHOMSIM’ app from the Android Play Store, IOS App. 
  • Step 2. Open “WHOMSIM” App on your phone. 
  • Step 3. Choose your language.
  • Step 4. Choose “My Page” > “Check Balance” on menu page.  
  • Step 5. Choose Put your mobile phone No. to check it.
  • Step 6. Credit balance and expiry date will be displayed.
  • Step 7. That’s all folk!


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