Can they will check the IMEI number on the server to check the date of warranty registered.

Just remind you if you want to get Xperia Z1 get the dock charger together so you will be hassle free. BTW Z1 is waterproof phone and the great feature there is the 3.5mm jack is not covered by flaps so no need to open and close the flaps when you want to pluck in earphones to listen to musics.

Do remember do not call Samsung as Samseng respect each other brand because every brand have their own pro and cons.

If you buy ZL its an upgrade in terms of screen resolutions, camera megapixel increase, better graphics, and IRDA system.

Cons is you lose S-Pen feature, Multi Windows, Big Screen and Air View system.

If you buy Z1 its an upgrade for overall spec but you still lose S-Pen / Air View / Big Screen feature.

The Multi Window feature is in Z1 and not in ZL is because ZL only supports 1 Mini Apps per times while Z1 supports until your screen is full.

Not sure the coming android 4.3 update will make it enabled to use more mini apps per time anot.