Globe and Smart started offering these emergency load services a long time ago. These services were called Globe GTSOS and Smart SOS, respectively. TNT also started offering their own emergency load service called SakloLOAD. These services functions the same way as a text loan where it allows subscribers to instantly borrow load, especially in cases of emergency. Once they register to the service, they will be able to send text messages even if they have zero load. There are different packages/variants to choose from and these are the ones offered by Smart, TNT, and Globe.
You can register to any of these services even if you have zero load and you will only be charged on the next reload.[Source: Smart, TNT, Globe]