Hi @xxdeefujitaxx and welcome to the Globe community.
For your first question : Maybe in your phone settings you have enabled the barring for international outgoing calls.
May I know the device that you are using so that I can help you step by step to check that? And are you a prepaid or postpaid subscriber?
For the second question: if I answer incoming calls, will I be charged for that?
The answer is YES, since you will be using the network for the incoming call services. Roaming rates will apply if you will be answering the call. However if you just ignore or cancel the incoming call, you will not be charge for that.
Question po: So once I activated my roaming sim here in the Philippines (tama po ba), and when I am in Japan, with Globe Sim, my friend who has a Japan local sim can call my roaming number? right? and then I can call her also with my sim? thanks