Following on from Carphone Warehouse, O2 are also taking pre-orders for the Samsung Galaxy S5 and the Sony z2 from today.
The S5 will be available in either black or white from April 11th, and a little later for the other colours.
The Z2 will be in store at the end of April in both Black and Purple.
If you preorder the Z2 you get opportunity to also get a Xperia Z OG tab for £99.99, as well.