The market for portable GPS-enabled devices is forecast to grow from 33.3 million units last year to 36.79 million in 2018, despite an anticipated dip this year.

Similarly, total revenue from these device is expected to fluctuate for the next couple of years but will rise to $7.14 billion (£4.5 billion) in 2018.

In this week's show we look at Google's new product announcements, O2's closure of its mobile telecare service and the clearance of radio frequencies for 4G services.

We also talk about the latest collection of quarterly results from Apple, Samsung, Amazon, LG and Facebook. Who's doing well - and should anyone be worried?

Mark Bridge writes:

Google’s big announcement last week involved the company introducing Android v4.3 (as expected), launching a new Nexus 7 tablet (as expected) and also revealing a ‘Chromecast’ HDMI adaptor that’ll stream from most portable devices. That was more of a surprise.

Less than five months after the public launch of its Help at Hand mobile care service, O2 UK has decided to close the m-health service down.

O2 Help at Hand was launched online and in shops on 5th March, having previously just been available via the NHS and local authorities. Customers received a mobile phone that offered GPS tracking, could automatically detect if the user fell and also had an ‘emergency’ button to contact a 24-hour support centre.

The GSMA has commissioned a report into mobile health technology that shows almost £85 billion could be saved in EU healthcare costs by 2017.

However, it warns that regulatory, economic, structural and technological barriers could result in mHealth only reaching 10% of its potential.