Nokia Lumia 1520

Fancy a bigger screen and super slick Windows integration? Then the 6-inch Nokia Lumia 1520 has you covered.

The Lumia 1520 has the biggest, highest resolution display of any Windows Phone device and its 2.2GHz quad-core processor also means it's one of the most powerful to rock Microsoft's mobile platform.

Once again you get Microsoft's Office software which sync wirelessly to the cloud, allowing you to easily move work between computer and phone and the increased screen size makes editing easy on the Lumia 1520.

Nokia Lumia 1520

There's little needed in the way of training, as the Windows Phone 8 (soon to be Windows Phone 8.1) interface is incredibly intuitive and doesn't offer up the multitude of confusing options that Android does.

Size and weight were always going to be an issue with the Lumia 1520, but considering it can replace the need for a tablet, and even at times a laptop, for a lot of tasks it's definitely a handset you should be considering.

Samsung Galaxy S5

The Samsung Galaxy S5 has more features than you can shake a stick at, from a fingerprint scanner on the front to a heart rate monitor on the rear.

Its slick Android KitKat interface, responsive and bright 5.1-inch full HD display and powerful quad-core processor means the Galaxy S5 has the vital statistics to make it a great business tool.

Add to that its highly adaptable email and note-taking applications, a host of connectivity options and on-device encryption to make sure all your top secret files are safe and secure, and you'll want to seriously consider this device.

Samsung Galaxy S5

In terms of style the Galaxy S5 is trumped by the all metal iPhone 5S, One M8 and Xperia Z2, but Samsung's handset is arguably more versatile.

Android is far more adaptable and customisable than Apple's iOS system, meaning that if you have some technical boffins in your ranks you will be able to tweak the Galaxy S5 to suit your firm's exact needs.

The Galaxy S5 also comes with Samsung Knox, a mobile solution built specifically for the business sector to ensure handsets are fully secure, from application and platform security to device management.

BlackBerry Q10

If you're still a fan of the traditional QWERTY keyboard on your smartphone the BlackBerry Q10 offers the best on the market.

Fully touchscreen smartphones are great for numerous reasons, but when it comes to the simple task of typing you won't find anything better than a physical array of keys.

With a 3.1-inch 720p touchscreen and the BlackBerry 10 operating system the Q10 is built for business, and it's unlike any BlackBerry handset you've owned before it.

BlackBerry Q10

The big advantage with the BlackBerry Q10 is its excellent support for business users.

IT departments can take control of the handset using BlackBerry Enterprise Service 10 (BES 10), with security provided by BlackBerry itself ensuring all your emails and messages are fully encrypted.

The Q10 has a feature known as BlackBerry Balance which allows you to flip quickly between work and personal profiles on the handsets, allowing you to keep the two separate with work controlling the business side while you have full control over your own area.

When it comes to watching videos, playing games or using apps the Q10 isn't quite so useful, as it's square screen makes these exploits rather tricky.

Google Nexus 5

If you want the best features to price ratio from your smartphones then you'll need to take a look at the Android KitKat running Google Nexus 5.

Manufactured by LG the Nexus 5 sports an impressive 2.3GHz quad-core processor, 4.95-inch full HD display and the latest version of the powerful Android OS all wrapped up in a package which will set you back just £300.

The Nexus 5 is beautifully designed, has more connectivity than a BT Telephone Exchange and even excels in the simple matter of making telephone calls.

Google Nexus 5

It is slightly hampered by only being available in 16GB and 32GB sizes with no microSD slot and the camera isn't the strongest here, but that's a minor issue for a business device.

Perhaps Android isn't the best mobile business solution, and the Nexus 5 lacks the additional enterprise features Samsung has added to its devices. But at such a low price it is definitely worth considering.

BlackBerry Q5

The Q10 is still quite expensive, so if you're desperate for a fleet of business focussed handsets which won't break the bank take a look at the mid-range BlackBerry Q5.

It doesn't look as stylish, nor feel as premium as the Q10 and the isolated buttons on the keyboard are very much a marmite feature, but the Q5 is still a highly capable smartphone.

With the same 3.1-inch 720p display, 2GB of RAM, BlackBerry 10 OS and 4G connectivity as its more expensive brother the BlackBerry Q5 will still make mincemeat of your emails, text messages and BBMs.

BlackBerry Q5

Another big advantage of all BB10 handsets are their web browsing ability - pages load in a matter of seconds and it's one of the most fluid surfing experiences you'll have on a smartphone.

As far as affordable smartphones go with a focus on messaging, internet and business the BlackBerry Q5 is one of the best in its class.