How to enable facetime in the philippines from my iphone purchased in Qatar?

I have been using Facetime and imessage from my iphone in Qatar. The unit was bought in the same country with Model A1429.

I went on vacation in the Philippines and used a local sim network (Smart). Everytime I insert the sim card facetime setting and icon disappears and when I put back my sim from Qatar (Ooredoo), it shows up again. I am able to use imessage on both sim.

Is there a way to keep facetime with the phone since it is not locked to Qatar carrier services?

Regards,

Romel