The 156Mhz processor of the Sony Ericsson Yizo just executes basic phone activities.
With one SIM card slot, the Sony Ericsson Yizo allows download up to 0.236 Mbps for internet browsing, but it also depends on the carrier.
It's weak on connectivity, this device has Bluetooth 2.1 + A2DP, but it doesn't have WiFi to connect to internet.
Including the battery, the Sony Ericsson Yizo phone has 81 grams and it's not so thin so, it has 15.5 mm thick.