No top up required, looks about the cheapest PAYG offer for this phone. Sony Ericsson Xperia X10 mini on O2 Pay As you GO mobile has an impressive 2.55 TFT capacitive touch-screen. The cell phone is fully loaded with features and integrates widgets like YouTube, Google maps, Google Search and Gtalk. The mobile has an integrated camera of 5.0 MP, which enables you to capture pictures and videos of your memorable events. You can enjoy fast internet surfing and gadget exhibits connectivity to GPRS, EDGE, Bluetooth and USB interface. The Sony X10robyn O2 payg is affordable and definitely it is a best pick.