If you've enabled roaming in your phone's settings and it's still not working after rebooting your device, then you may have an account related issue with your provider back home. I would recommend contacting them as your next step to make sure you don't have any roaming blocks on your account.
Re: How do I enable Roaming using Philippine sim card?
Actually Im talked to them a while ago and the customer service representative told me that there is nothing wrong with them. They instructed me to cancel the automatic button so I will search manually for the service provider. But when I click the Rogers 2G and 3G it doesn't work
It may be the case that your phone is not compliant with our network if it will not connect automatically or manually. Enabling roaming has been made rather simple with modern smartphones. As long as your plan supports roaming, it should be as simple as flipping the roaming toggle on and that's it.