It seems Asus and O2 are onto something. Apparently, Global Certification Forum (GCF) has just approved the Asus GM5, codenamed “Christal,” which seems developed for the Telefonica-owned O2 mobile operator. The so called O2 Xda Zest will almost certainly run Windows Mobile (like all other Xda phones do), and will sport a tri-band GSM radio [...]