Yup, I moved to the Phils last year February, so my comments on top of what has already been said:
- We did the mail forwarding thing for a month, since it is actually quite expensive for what are likely bills or sometimes spam/info mail. Worked fine, though previous experience with mail forwarding of Singpost has shown it is not very reliable in general.
- I kept my SG account with Citi, no issues in changing the address and mobile number to overseas for the banking account. I am all electronic for banking side, so no mail coming here from them. Mobile OTP works fine. You can transfer easily between Citi SG and PH accounts afaik, but keep in mind that Citi PH only has about 5 or 6 branches in Manila, and interbank money transfers do not exist here.
- One more thing about banking in the Phils: you should open an account with both BPI and BDO, the two major banks here. Their ATM networks are a bit unreliable, as are their payment networks, so it is good to have a backup in case one of them fails. If you are employed in the Phils, you are likely to need a salary account in either one of those two banks anyway.
- For credit card, keep your SG credit cards! You need to be employed in the Philippines for about a year before you even qualify for a local one, with the exception of BPI's express credit - which gives you an available credit limit of 80% of your fixed balance (which you cannot withdraw, ever).
- Buying property here is not a huge hassle bureaucratically. BUT: The Nr. 1 payment method for this (unless you pay in-full one-go in cash) is post-dated checks. (Same applies for rental, btw.) Which you can only get if you have a checking account. Which they may not give you right away from the bank side, seeing as you are a freshly arrived foreigner. (Even as a Filipino, the same applies.) The way I did it is go through my in-laws, and transferring them the monthly amount.
- Most of our stuff was moved through balikbayan. It is fairly cheap, and in general reliable, though it may take up to 4 weeks for the boxes to arrive now. This obviously won't work if you plan on shipping furniture, though honestly unless those are heirlooms or very expensive furniture, it is hardly worth shipping - you can have anything you want made-to-order here if you are so inclined.