Like a Mac or iPod, an AppleCare Protection Plan (APP) is also available for the iPhone 3G.
Taken from Apple's website, APP is explained here
Every iPhone comes with one year of hardware repair coverage and up to two years of technical support.(1) The AppleCare Protection Plan for iPhone extends your repair coverage to two years from the original purchase date of your iPhone.(2) Whether you use iPhone with a Mac or a PC, just one phone call can help resolve most issues.
Extend your coverage to two years of service and expert telephone support.
Peace of mind
Should your iPhone need service under the plan, Apple-authorized technicians will repair it or provide a replacement using genuine Apple parts.
We recommend that you purchase the AppleCare Protection Plan with your new iPhone to take maximum advantage of the coverage the plan provides. This plan is available for iPhone within its one-year limited warranty, used with either a Mac computer or a Windows PC.
- iPhone comes with up to two years of technical support during the term of your AT&T wireless contract. AppleCare Protection Plan benefits are in addition to any legal rights provided by consumer protection laws in your jurisdiction.
- This plan extends your service coverage to two years from the date of your iPhone purchase. The plan must be purchased while your iPhone is still under its original one-year warranty. Service coverage may be subject to certain restrictions.
The only thing I'm not sure is whether you can buy the AppleCare from Globe or if you have to go to an Authorized Apple Reseller. In the US, APP costs $69+tax but lets see how much will it retail here in the Philippines. You can't really guess by converting it as taxes and exchange rates puts additional digits to the equation. Tech support for the iPhone is directly from Globe so I'm sure they're already on training.