Four years ago, before I applied for my naturalisation ( British Citizenship). I remember phoning the Phils. Embassy and asked some of my questions.
I.e
Am I still a filipino citizen if I attended a Ceremony for my Naturalisation? and I remembered what the Embassy told me. Automatically you're no longer a Filipino Citizen but you can obtain it again by means of dual citizenship and you have to apply for Retention and Reacquisition (which I did after 3 months).
My Next question then was, Can I travel with my Philippines after I attended my ceremony for my naturalisation? No, you're not allowed to travel with your Philippines Passport after you attended for your naturalisation ceremony even if your Phils passport is not expire.