Outgoing calls won't be a problem since I will be using Skype at my home away from home.
I basicly just need my UM card for some incoming calls, good thing I'll mostly be staying in cities considering that China Unicom's GSM coverage doesn't seem to be that great.
Active Prepaid SIMs: United Mobile; (RC)
China Mobile; (USA)
TúYo; (D) Loop, Callya, Simyo; (A) Klax; (I) Wind; (B) Ay Yildiz
Former Prepaid SIMs: (RC) IF; (D) Free&Easy, Xtra; (A) Yesss; (UK) Pay&Go; (E) Movistar; (IS) Frelsi
Mobiles in use: Sagem my101X, Siemens M50,
Nokia 6800,
Siemens M65, Motorola E770, Samsung SGH-Z500, Nokia 9500
Previous Mobiles: Nokia 5130, Motorola V3688, Sagem myX-1, Siemens M55, NEC e313, SonyEricsson T200, Motorola V980, Siemens C45, Motorola V600