The Carphone Warehouse has introduced a "Network Price Promise" that guarantees to match any deals available from the UK's major mobile networks.

It applies to new connections and upgrades for prepay and 'pay monthly' contracts.

In this week's edition of The Fonecast we're talking about privacy on iPhones, Nokia's smartphone plans, phoning via Facebook, legal battles and complaints to Ofcom.

We also prepare for our forthcoming 250th podcast by turning the clock back to 2007, when we discussed the 'cashback crisis' that had hit a number of mobile retailers.

The British Retail Consortium and Google have launched a joint 'Online Retail Monitor' to provide insights into online shopping trends.

It reveals that the total volume of online retail-related searches in the UK grew by 29% in the first quarter of 2011 compared with the same quarter a year earlier. However, mobile retail search traffic rose by 181% over the same period. Overall, 11% of total retail searches in the first quarter of 2011 were made on a mobile device.

Best Buy Europe - the joint venture between Carphone Warehouse Group plc and Best Buy - is selling its retail business in Belgium to the country's largest telecoms company, Belgacom.

The deal is worth 22 million Euro and excludes Best Buy Europe's Belgian insurance customer base.

In this week's edition of The Fonecast we're chatting to David Emm, senior security researcher at Kaspersky Lab UK, about the security threats facing mobile phone users.

We also discuss the latest report from mobile tariff comparison site Billmonitor, we talk about Tuesday's Symbian news, we look at a new unlimited internet deal and we discover a clutch of MVNOs.