Please tell us some basic information before asking for help:
Model Name: Asus Zenfone 5 (ZE620KL)
Firmware Version: V16.0615.2006.131
Rooted or not: NO
Frequency of Occurrence: N/A
APP Name & APP Version (If your issue relates to the app): N/A
Will we ever experience VoLTE with this phone here in the Philippines?
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