I am planning on buying a cell phone soon in the US. Preferably, I would want a phone that has dual SIM card slots and quad frequency capability (850/900/1,800/1,900 MHz). Is this all I need hardware-wise for a phone to work in the UK (and possibly Europe in general)?
Other than that, I would need the appropriate phone plan. Are there more requirements I need? Such as: do the WiFi bands in the US work with WiFi in the UK (that phones use, laptops, etc.)?