Problem with Happy Prepaid app login
Hi, I just bought a prepaid card and downloaded the Happy Prepaid app. However, after I keyed in my phone number, the following error message appeared, "PIN request failed. Please try again". I uninstalled the app and tried several times but still the same error message. I've already inserted the new card in my phone and I'm using Redmi Note Android 4.4. Please advise. Thanks.