Barcelona's MWC (Mobile World Congress) 2015 kicks off today, and many of the press events were already held this weekend. We tell you what to expect from all the biggest exhibitors, including Samsung, Sony, HTC, LG, Huawei, Microsoft, Google and Motorola, and round up the top news stories and live video streams from MWC 2015. Also see: Best new phones you should be most excited about in 2015.

Scheduled for 2-5 March, MWC 2015 is happening right now. For all you fans of mobile tech products it's the highlight of the calendar with CES only bringing a handful of devices this year – namely the LG G Flex 2.

We're in mainland Europe to bring you full coverage of the show, and here is what to expect from the big names which will be exhibiting in Barcelona including smartphones, tablets and wearables.

News from MWC 2015: Samsung

Samsung's event saw the Korean giant unleash the Samsung Galaxy S6 and Samsung Galaxy S6 Edge smartphones. The company also announced Samsung Pay - a rival to Apple Pay and Google Wallet - and a new VR headset.

News from MWC 2015: HTC

Meanwhile HTC's big launch saw the company announce its new flagship smartphone in the form of the HTC One M9. HTC also announced its entry to the wearables market.

HTC One M9 event

News from MWC 2015: Sony

Like Samsung, Sony stuck to other areas at CES despite rumours of the Xperia Z4 being unveiled. The big news was that Sony didn't bother with a live event, and didn't launch the expected Xperia Z4 and Xperia Z4 Compact smartphones. In fact we saw a new Sony Xperia Z4 Tablet. It had already announced the new budget Xperia E4.

Sony also announced the Sony Xperia M4 Aqua, a mid-ranged smartphone

What to expect from MWC 2015: LG

LG is the other manufacturer in the big four for MWC and although it did announce the LG G Flex 2 at CES, we're expecting a lot more in Barcelona.

Last year, LG announced the G3 at a London based event in May so it's no certainty that the G4 will arrive in March at MWC. In fact, an LG exec said it won't happen according to The Chosun: "We rolled out the G3 in May last year so we do not plan to unveil the G4 at this year's Mobile World Congress and spend more time perfecting the new phone."

Despite that quote, there's still a chance and the firm will probably announce other smartphones and tablets such as new L-series devices and hopefully a replacement for the LG G Pad 8.3. Read all the LG G4 rumours here.

On the wearable side of things, we wouldn't be surprised to see something new to follow on from the LG G Watch and LG G Watch R - perhaps something more on the fitness tracker side of things.

Ahead of MWC, LG has shown off the luxury G Watch Urbane and four new smartphones called the LG Magna, LG Spirit, LG Leon and LG Joy.

What to expect from MWC 2015: Huawei

The Chinese vendor will be present in Barcelona this year and has a press conference scheduled for Sunday 1 March at 3pm. The save the date we've been sent gives no clues as to what will be announced but has confirmed to TechRadar that it will launch an Android Wear smartwatch this year. MWC seems like most likely place to unveil it and the event invitation appears to confirm it. The invitation suggests you'll be able to take a phone call on the device which also seems to have a camera built into the strap.

Huawei MWC 2015 press conference

Although it seemed the launch of the Ascend P8 would take place at MWC this year. Huawei has confirmed to multiple tech media sites that the smartphone will actually be launched in London on 15 April. The Ascend P7 was launched in Paris and the Ascend P6 was launched in London.

Huawei has also confirmed it will launch at least one new tablet.

What to expect from MWC 2015: Microsoft

Microsoft doesn’t normally have a big presence at shows like MWC but will be in Barcelona this year. A press conference will take place at 8:30am on 2 March.

“Mobile is transforming communication, advancing the next payment system that alters commerce, and expanding ways in which we interact. Similarly, the world’s premier industry continues to expand. Once again taking place at Fira Gran Via – the world-class venue in the heart of the Mobile World Capital. You won’t want to miss the opportunity to witness the industry’s continued expansion and growth,” said the firm.

Microsoft MWC 2015 press conference

Although that doesn’t give much away we expect  to hear more about Windows 10 on smartphones and tablets. We could certainly see some new devices unveiled but a new flagship Lumia (the Lumia 940?) is less likely and will probably be announced later in the year closer to the full launch of Windows 10.

If you can’t wait to get Windows 10 on your phone you can download the Technical Preview now if you have a selected Lumia handset and don’t mind running buggy software.

What to expect from MWC 2015: Google

Google normally announces Nexus smartphones and tablets at its own launch events such as Google I/O. However, the rumour mill suggests Google will present is modular smartphone called Project Ara at MWC this year.

A total of 50 components will supposedly be on display as well as a complete working handset.

Google Project Ara

What to expect from MWC 2015: Motorola

Now owned by Lenovo, we're not expecting a huge amount from Motorola at MWC. It's just launched various smartphones in China.

A new version of the budget Moto E is thought to be announced in Barcelona, though. It's probably going to be called the Moto E 4G and has already shown up on BestBuy in the US. A 2015 version of the Moto G 2014 also with added 4G LTE support is a possibility and don't rule out a new model of the Moto 360 smartwatch although Motorola just announced three new bands for it.

Top stories from MWC 2015

4. Samsung Galaxy S6 Edge review

The Galaxy S6 Edge is the dual edge version of Samsung's new flagship Galaxy smartphone. Here's our full and in-depth Samsung Galaxy S6 Edge review.

5. Samsung Galaxy S6 Edge UK release date, price & specs, photos

Samsung has confirmed the Galaxy S6 Edge, a variant of the Galaxy S6 that has a curved edge to create additional screen space for notifications. Here are the Galaxy S6 Edge specs, release date, price and new features, and information on where to buy the S6 Edge.

6. HTC 10 launch live blog as it happened

Today HTC will unveil successor to the HTC One M9, the brand-new HTC 10. Join us live as we bring you real-time announcements from the HTC 10 launch. HTC 10 live blog.

7. HTC One M9 review: A gorgeous Android phone for 2015

The new HTC One M9 is absolutely gorgeous, but hardware hasn't moved on much so can it compete with the iPhone 6 and Samsung Galaxy S6? Read our full and in-depth HTC One M9. HTC One M9 specs, HTC One M9 display. Updated: 18 January 2016 with audio tests.

8. HTC One M9 release date, price and specs | On sale today

HTC One M9 specifications and features. New HTC One release date, price and specs. When is the HTC One M9 coming out? New features in HTC One M9 - New HTC One photos and video - details of new HTC One. HTC One M9 on sale today.

11. Sony Xperia Z4 UK release date, price, specs

Sony has announced the Xperia Z4 phone, but only for Japan. In the UK, we'll be getting the Xperia Z3+ which is pretty much the same. Here's what you need to know about the Xperia Z4 (or Z3+) release date, price and specifications.

12. Sony Xperia Z4 Tablet review

Sony's Xperia Z4 Tablet is the latest 10in Android tablet on the market and a rival to the iPad Air 2 and Samsung Galaxy Tab S 10.5. Here's our Sony Xperia Z4 Tablet.

14. Sony Xperia M4 Aqua review

Sony didn't announce the Xperia Z4 flagship smartphone at MWC 2015 but we're impressed by its new mid-range device. Here's our Sony Xperia M4 Aqua review.

18. Microsoft Lumia 950, 950 XL UK release date, price & specifications

The Microsoft Lumia 950 and 950 XL are among the first Windows Phones to run Windows 10 mobile, and they are available to pre-order from Microsoft now - at an already reduced price. Here's what you need to know about the Lumia 950 and Lumia 950 XL UK release date, price and specifications.

19. HTC Vive vs Samsung Gear VR Innovator Edition comparison preview

Both Samsung and HTC have announced new virtual reality headsets at this years Mobile World Congress. Although they look similar, they couldn’t be any more different. Which is best? When are they out? How much will they cost? We've got a comparison between the two to help you make up your mind...

20. Lenovo Tab 2 A8 release date, price and specs

Budget Android tablets aren't hard to come by, but those with good sound are. Lenovo hopes to appeal to those who appreciate high-quality audio with built-in Dolby Atmos. Here's what you need to know about the Lenovo Tab 2 A8 release date, price and specifications

26. Intel Atom x3, Atom x5, Atom x7 release date, specifications

Intel launches Atom x3, Atom x5 and Atom x7, making a play for the budget smartphone market. Intel Atom x3 features, specs, release date; Intel Atom x5 and Intel Atom x7 features, specs, release date. Everything you need to know about Intel's new mobile chips.

27. Samsung Galaxy S6 mini UK release date, price and specs predictions

When is the Samsung Galaxy S6 mini coming out? With the Samsung Galaxy S6 pegged for March's MWC, Samsung will in typical fashion follow up that smartphone with the launch of a compact version. Here we reveal our Samsung Galaxy S6 mini UK release date, price and specs predictions.

33. HTC One M9 vs HTC One M8 smartphone comparison

We compare the HTC One M8 with the new HTC One M9. The new specs and new features of the HTC One M9, and how do they compare to the HTC One M8? Read our HTC One M9 vs HTC One M8 smartphone comparison to find out.

34. Samsung Galaxy S6 vs HTC One M9 comparison review

Back in March Samsung and HTC both unveiled their new flagship smartphones for 2015, but which is best? We compare the price, design, specs and software in our Samsung Galaxy S6 vs HTC One M9 comparison review.

35. Samsung Galaxy S6 vs Sony Xperia Z4 comparison

With only one of these phones making an appearance at MWC 2015, your decision between Sony Xperia Z4 and Samsung Galaxy S6 just got easier. Here we compare what we know about the Samsung Galaxy S6 and what we think we know about the Sony Xperia Z4 to help you choose which is best for you.

36. HTC One M9 vs Sony Xperia Z4 comparison preview

Only one of these two smartphones made an appearance at MWC 2015, with the HTC One M9 going on sale at the end of the March and the Sony Xperia Z4 now delayed until September. So, should you buy the HTC One M9 or wait for the Sony Xperia Z4? We find out in our HTC One M9 vs Sony Xperia Z4 comparison.

38. Acer Liquid Leap+ hands-on review

The new Acer Liquid Leap+ fitness tracker and smartwatch in one works with Android, iOS and Windows Phone. Here's our Acer Liquid Leap+ review from MWC 2015.

41. LG Watch Urbane review

LG has taken the G Watch R and given it a new metal design and built-in Wi-Fi. Here's our LG Watch Urbane review.

44. Huawei Watch review

After multiple 'launches' the latest Android Wear smartwatch is here so here's our Huawei Watch review.

45. HP Spectre x360 hands-on review

Laptops aren't a big deal at MWC 2015, but HP's new MacBook Air and Lenovo Yoga 3 Pro rival caught our eye. Here's our HP Spectre x360 hands-on review.