Guys walang permanent block sa sun sim as of now. Tested ko.
Dapat may 100 pesos load balance ka. Follow these steps:

1. Turn off data
2. Set network to 2G
3. Dial #222*1*1*2#
4. Check inbox. Wait for SUNCELLULAR reply na activated na Roaming
5. Then dial #222*2*1#
6. Check inbox. Wait for SUNCELLULAR reply na deactivated na roaming
7. Set network back to 3G/4G
8. Turn ON airplane mode
9. Turn OFF airplane mode
10. Open data connect ehi or kpn then Enjoy! 😊