For Globe subscribers, 236 is the prefix you use to avail of their P20/20 minute call rate. There are other prefixes available on Globe which you can use to get the best value for your peso when making calls, but they have, however, released an advisory warning against returning calls to numbers with +239 or 00239 as its prefix.
These are not local numbers, but are, in fact, coming from SaoTome n Prince. Calling these numbers will be charged with the corresponding IDD call rates. Here’s the full message I received from Globe:
FREE Globe Advisory: Beware of fraudulent calls! You may receive calls starting w/ nos. 00239 or +239. These are from SaoTome n Prince. If u don’t know anyone frm these countries, don’t call back missed calls to avoid getting charged for IDD calls. Call us at 211 to report fraudulent calls!
So, be careful guys. Nobody wants their load to be wasted on unnecessary, needless and fruitless calls such as this one.