O2 has been one of the UK's top networks for donkey's years, but if you've never used the effervescent brand before you might not be aware of what's on offer - here's our run-down of the best O2 phones and what treats you can expect in return for a monthly wedge of cash.
When talking about Bolt Ons, we'd hope (unlike Google it seems) that you'd realise we weren't thinking along the lines of famous Boltonians Peter Kay or Paddy McGuiness.
No, we're talking about the optional extras that O2 allows you to add on to your monthly contract.
Ranging from international calls to picture messaging and insurance, they hope there's something to appeal to everyone.
There's even the ability to purchase a further 100MB of data on top of your monthly allowance, should you find that you are close to running out. This could be particularly useful as all data-enabled plans include tethering.
So, what basics do you get to begin with?
Bonus plans come with unlimited texts, with varying levels of minutes and data, and Standard plans come with varying levels of everything.
Forgive our greediness, but things heat up on the "On & On" tariff, coming bundled with unlimited calls and texts, and 1GB of data.
This isn't limited though, as you can double that should the mood take you.
On top of that, on all data plans of 250MB or more, you can add free Wi-Fi on BT Hotspots. Interestingly, for those less data hungry users, O2 offers to reduce your plan costs if you limit yourself to 100MB.
Finally, we have to mention O2 Priority. It's all in the name here, providing first option on a variety of tickets at O2 stadiums and arenas nationwide as well as high street vouchers direct to your phone.
Obviously you're going to want to make use of all of this, but how?
Sony Xperia S
Sony's first foray into the mobile world after completing the buyout of former partner Ericsson, comes in the form of the Xperia S.
Sony opted to pack in its own Bravia engine, taken from its TV range, which has helped create a really fantastic screen.
Inside you'll find NFC technology, a dual-core 1.5GHz processor and a high-end 12mp camera.
Read our full Sony Xperia S review here.
HTC One X
The HTC One X has bounded onto the scene, and with its HD screen, NFC capabilities and quad-core processor it really is one of the top phones of the moment.
It's running the latest version of Android in the shape of Ice Cream Sandwich, plus one of the best cameras on the market - capable of shooting 99 photos in a row and taking snaps while recording in 1080p HD.
In short, one of the best phones around right now.
Read our full HTC One X review here.
LG Optimus 4X HD
Looking at it, you can tell the Optimus 4X HD is a smart phone.
LG might not have the reputation of the likes of Samsung or HTC when it comes to producing high-end devices, but as the name suggests, the LG Optimus 4X HD comes with a quad-core 1.5 GHz Nvidia Tegra 3 chip, 8MP camera, NFC and the impressive Android Ice Cream Sandwich to hold it all together.
Read our full LG Optimus 4X HD review here.
Samsung Galaxy S3
Replacing a phone that could be on this list, the Galaxy S2, comes Samsung's latest flagship Galaxy phone.
We can't speak highly enough of the Galaxy S3, as it brings a superb Super AMOLED HD screen, NFC, 8mp Full HD recording camera and a "blazingly-fast" 1.4GHz quad-core processor.
Unsurprisingly, it comes with Ice Cream Sandwich, but Jelly Bean is looking very likely.
Read our full Samsung Galaxy S3 review here.
Apple iPhone 4S
The original iPhone was a game changer, and this is continued with the 4S.
The fifth iPhone so far comes in with a proprietary dual-core processor, and Apple's wonderful Retina Display to bring apps to life.
Apple know that a smart phone's real strength lies in its app catalogue, and you'll be unsurprised to find that its iTunes store is packed full of high-quality offerings.