I had just receive the old iPhone5 of my sister, it was a postpaid Globe phone back then. When I received the phone, I bought a nano lte globe prepaid sim card. I have activated it in 2200 already. My question is, when I text "FREE to 8888" it says 'Sorry, but this service is available to select Globe Prepaid Customers only. What can I do? My sim is prepaid and yet this is the reply.