The downfall? Red Mobile requires a 3G phone. These phones are the high-end types which most of the B and C classes cannot afford. The B and C classes are what you need in order for your network to establish a "community" ---something which Globe/Smart/Sun already have. Further, the rates calling/texting outside the Red network is expensive (P6.50 for calls, P1.00 for text) so the P0.50 rate is Red-to-Red only. That's why it's really important to read the fine print first.
Need more proof? Here's a review from another blogger who got a replacement Red Mobile sim for his Cure sim.
So, sulit nga ba ang Red? :-)