3G or 4G

[Crewmeal]

I'm looking at buying a Sony Xperia Z but reading up about it, I understand that some models are 3G only whereas some are 4G as well. How do I tell the difference if I'm looking at buying off ebay?

 

[Slug]

The LTE-enabled model number is C6603. The HSPA+ (3G only) version is the C6602. Physically there's no difference, so you'll have to rely on the seller's good faith or a photo of the Settings/About phone display.