I agree with ryzaadit, I wouldn't bother testing Howl, heard plenty of bad things about it.

Just checked the "juristictions" part at Stake and the Philippines are definitely not listed as a banned region. So normally there should be no problem to register and use it.
Since you would be a new member you would need to make KYC before even being possible to get a deposit address, so maybe just try and test it out.