GS99 or Go Surf 99 has a 200 MB allocation only. if you use your MB allocation in video streaming or FB photo viewing then this will not last for 1 month. The validity period serves only as guideline of when will this promo ends up assuming that your MB allocation is not consumed or used up.
For more choices of what GS promo should you try to avail, visit this link. https://www.globe.com.ph/surf/plan/gosurf
I have registered in gs99 and my data didnt even lasted for a week.. My allocated data is 200mb but the freebies should be valid for a month.. Then why i cant accessed pokemon go since thats the freebie i choose and i never even play coc or clash royale.. I cant even check the status of my freebie...