Small review of my new phone: Iíll admit Iíve never understood the large-screened ďphabletĒ craze until I got my Galaxy Note 1 (going back nearly 3 years now!). I just couldnít see the appeal of phones that are too large to comfortably fit in a jeans pocket, but too small to really replace a tablet for a more grown up web browsing or reading experience. It was with this apprehension that I approached the Note 1 and I loved it from that moment on. Since then, I have recently graduated to the Sony Xperia Z Ultra. This device takes the phone screen size to extreme, and the tablet size to micro proportions. And it delivers on both fronts!

Initially I began using it as I would use the latter, a tablet that complimented my smartphone rather than replaced it. Teamed with the compact Note 1 (whilst waiting for my phone stuff to transfer over to the Xperia), this combination worked rather well, but it wasnít until I ditched the Note 1 today and made it my main device that I began to understand the appeal.

The Sony Xperia Z Ultra is defined by its 6.4-inch 1080p display. This is less than 10% shy of the 7-inch compact tablet standard established by devices like the Nexus 7. Iíve never been impressed by displays on Sony smartphones, they always look washed out and have poorer viewing angles than similarly priced devices. However, the Sony Xperia Z Ultra is the first that has wowed me. With vibrant colours, good viewing angles and excellent usability outside, this is a wonderful device to use from a visual perspective. It has a screen that is viewable from almost any angle you look at it (except from behind obviously!)

The extra room afforded by the display size is employed extremely well, as the Xperia Z Ultra makes use of a higher ďvirtual DPIĒ as it were, allowing more information to be displayed on the screen at any one time. This is very important to note, as not all large-screen devices do this. Considering my HTC One shares the 1920◊1080 resolution on itís 4.7-inch display, itís great to see Sony doing more with the additional 1.74-inches of physical room on offer.

The Xperia Z Ultra doesnít disappoint in other specifications either, with a speedy Snapdragon 800 clocked at 2.26Ghz, 2GB of RAM, 4G LTE and 16GB of storage augmented by a microSD slot (currently maxed out at 64gb, however Sony have said they're willing to up this to 128gb as and when the cards become mainstream). While it shares the resolution of the latest version of Nexus 7, itís crammed into a far slimmer package. The Xperia Z Ultra would have to be one of the sleekest devices on the market at just 6.5mm. Compare that to the already-svelte iPhone 5S at 7.6mm and the positively portly LG G2 at 8.9mm.

All this does come at a heft, however, with the Xperia Z Ultra tipping the scales at 212g. Itís exactly 100g more than the iPhone 5S and 69g on the LG G2, but thanks to the way itís spread out it never feels like it. Itís well distributed throughout the phone, too. Looked at as a tablet, the Xperia Z Ultra is remarkably compact, but switch tact to think of it as a phone, and itís borderline hilariously large. It incorporates all the traits required to be a phone, including an earpiece and auto-screen off when held to your head, but be prepared to get noticed, as against your head, this thing is massive.

This isnít conjecture either, as it drew quite a lot of stares as I stood outside my local bakery shop chatting away as I waited for my morning dose of danish pastry. Itís rather uncomfortable to use as a phone, too. The large, flat dimensions mean it sticks out from your head on all sides, and never really ďgelsĒ with your face. Say what you will about bendy smartphones, but at this size it almost sounds like a solution to the problem. The earpiece isnít very loud, nor is the loudspeaker when used for speakerphone or music.

Frankly, the Sony Xperia Z Ultra is best used with either a wired or wireless headset. The former is quite socially acceptable, but the Bluetooth Borg look isnít something Iíve ever embraced. Iíd prefer to hold the Z Ultra to my head. Living with the Xperia Z Ultra on a daily basis is far more useful than I could have imagined. Does it do more than my Galaxy Note 1? Not really, but itís the experience that feels quite different.

While a 5.7-inch display on a ďphabletĒ doesnít feel especially different to using a phone (except being more awkward at times), the 6.44-inch display on the Sony Xperia Z Ultra bridges the phone-tablet divide remarkably well. Most mornings Iíd take my Asus Transformer down to the bakery shop if I was staying for breakfast, since itís a great way to catch up on both local news and read my favourite tech sites. The Xperia Z Ultra has all but eliminated that compulsion, as itís size is a delightful compromise of screen size versus carrying a second device. Most sites display their mobile versions by default, but aforementioned DPI setup means that more is displayed at all times. I have good eyesight when using my glasses, so the size is perfect.

Video playback is similarly impressive, where its 16◊9 aspect allows the whole display to be utilised, compared to 4◊3 on the iPad Air. The inclusion of a microSD slot means itís unlikely youíll run out of space. 64GB microSD cards are stupid cheap now, making for just over 70GB of usable storage when including the internal storage. On the software front, Sony has shown far more restraint than some of its competitors. Where Samsung and LG have changed practically every single pixel of the Android interface, Sonyís effort is very mild. The colour scheme retains the blue and white elements of stock Android 4.3, with minor changes to the aesthetic of the launcher and Settings panels. The notification shade contains Sonyís own quick toggle bar that can be customised with as many or as few switches as you like. (I currently have 7 icons on my toggle bar)

Itís not pure Android, but Sony has surprised a lot of people by introducing a Google Play Edition of the Xperia Z Ultra which is! The keyboard has similarities to third-party keyboards, including long press for numbers and symbols across the whole keyboard. SwiftKey is still my Android keyboard of choice, but for those who donít stray from the standard inclusion, the Sony effort is a good one.

The one thing I would have loved to see is a feature akin to Samsungís excellent Multi-Window (which I only recently got on the Note 1). Considering the large display, and its higher virtual DPI allowing more to be displayed in the same space, it would be a perfect addition to the Xperia Z Ultra. It does feature ďfloating windowsĒ like some LG devices, but itís just as pointless here. The way it covers part of the content in the main window makes it just annoying.

A neat trick the Xperia Z Ultra has up its sleeve is waterproofing. Fitted with seals around the microUSB, microSIM and microSD slots and a waterproofed headphone socket, the Xperia Z Ultra will happily get splashed or even fully submerged without ill effects. I actually dropped this phone in the bath and could still use it under water, and have happily been using it watching youtube videos whilst having a shower in the mornings. After an outing at the beach recently, I hosed the sand off the Xperia Z Ultra, much to the interest of passers-by who were looking at me as if I was mad!

The display is, however, extra sensitive, and will respond to the taps of most ball-point pens. Itís hardly a substitute for the S Pen used on the Galaxy Note, but itís nifty, none the less. Be careful though, I think my Xperia Z Ultra picked up a few minor marks because of this.

Around back is the 8-megapixel camera, which takes decent if unremarkable photos. There seems to be an awful lot of processing going on between real life and the JPEG, as edges and smooth gradients tend to get pretty crunchy very easily. Fine textures are smoothed out, white balance is easily thrown and its dynamic range clearly isnít as good as the iPhone 5S. Of note, an iPhone 5S shot weighed in at 2.2MB, while the was less than 900KB. I took identical photos here in my office for the comparison. Also the lack of a flash is somewhat annoying when it comes to the phones picture taking ability whilst out and about at night.

Thanks to its large surface area (certainly not its waistline), Sony have filled the innards with a 3050mAh battery, on par with big-batt phones like the LG G2 (3000mAh) but just shy of the phablet king, the Samsung Galaxy Note 3 (3200mAh). While it doesnít have the staying power of the LG G2, it can more than make it through a heavy day of texting, emailing, web browsing and media playback. I frequently use my phones as Bluetooth music sources when using public transport, so that tends to add a bit of extra strain to the battery too.

Sony have clearly implemented some sort of quick charging protocol, as it takes far less time to recharge than my Note 1, which has a much smaller 2500mAh battery. The only other mainstream competition at this size is the HTC One Max. Iíve used the HTC One Max briefly at the Three shop in Luton recently, and while it is a quality piece of hardware, it lacks the sleek design of the Xperia Z Ultra, and makes far less use of its gargantuan dimensions with a smaller 5.9-inch display.

So what is the Sony Xperia Z Ultra, a phone or a tablet? I canít tell, but in the last few weeks I have tried it as both a companion and a daily, and it easily slips into the latter role very well. Its reasonable price (£400 unlocked) is another win in its favour, and makes other Android flagships and the iPhone 5S look downright pricey when you consider what is on offer. For that money, youíre getting top of the line specifications, waterproofing, and a solid build quality in a rather unique device that straddles the roles of tablet and phone with amazing skill.

It will now be my only phone, however, during the week when Iím carrying a messenger bag or otherwise have my hands free, the Xperia Z Ultra isnít a particular chore to carry around. Heck, it even fits rather nicely into the pocket of a baggy pair of shorts or even quite well into my work trousers, slip on some jeans for a night out though, and the size hits a practicality wall.

In all, I would say this phone is amazing for what you pay. It has its practical limitations thanks too its size, but for a device that can converge between tablet and phone, there is nothing better on the market in my opinion.