I subscribed to GOTSCOMBODD90. The speed was slow. After checking my email, opening my fb, and surfing the web for a few minutes, I got disconnected. When I checked my balance, it was already zero mb. I was absolutely sure I had only used up a tiny fraction of the 2GB of data offered in this promo. I had encountered the same problem with GOSURF50, as well. It was frustrating. What went wrong, why it happend, and how to prevent it? Any idea? Thanks.