Stewart -there isnt a 21 day visa thats free -yes you can stay in phils for 21 days without visa but as you are planning to stay longer then best to get 59 day visa in advance before you go , if you have a return ticket that is outside that 59 days -then maybe some problems but you could also get an onward ticket one way to one of other asian countries that would make you stay in phils more legit