A new research report by Berg Insight predicts that revenue from mobile location-based services in Europe will grow from €735 million last year to €2.3 billion (£1.9 billion) in 2018, which is a compound annual growth rate of 25.8%.

Meanwhile, the North American mobile location-based service market is expected to grow at 16.1% per year from $1.8 billion in 2013 to reach $3.8 billion (£2.3 billion) in 2018.

The quality of the audio experience on mobile devices hasn’t kept pace with other developments, according to a new report from ABI Research.

It described audio as “the Achilles’ heel” of feature phones, smartphones and tablets.

Producing mobile phones for older customers requires much more than big buttons and a simple interface. At Mobile World Congress last month we spoke to two major players in this growing sector: Swedish company Doro and Austria's Emporia Telecom.

Our first conversation was with Harald Obereder, Chief Technology Officer at Emporia, who spoke to Mark Bridge about handset design and user interface design. This was followed by an interview with Chris Millington, Managing Director for Doro UK and Ireland, about research and development in the 'senior tech' market.

We begin this week's programme by looking at Vodafone's acquisition plans in Spain before moving on to discuss universal mobile chargers and 4G roaming.

There's also time to talk about UK mobile coverage, EE's new customer tracking service, contactless transactions and a smartphone camera that can identify objects hidden behind something else.

UK mobile network operator EE has launched a new retail service called ‘Connected Retail’ to help shops monitor their customers’ behaviour.

Although full details haven’t been announced, the new service is described as using mobile connectivity inside shops “to improve the customer experience and open new revenue streams”.