Mark Bridge writes:

It’s a smartphone autumn, as prophesied a few weeks ago by the Carphone Warehouse and many others. The frenzy of big-name announcements led by Samsung at Berlin’s IFA has given way to stand-alone media presentations from Nokia, Motorola and Amazon.

Direct operator billing specialist MACH has been chosen to help VoIP company Skype offer direct-to-carrier billing in key markets from October.

It means that Skype customers in certain countries will be able to buy call credit by adding it to their mobile phone account rather than paying via debit or credit card.

Microsoft has released the ‘Gold Version’ of Skype for Windows Phone, marking the end of the product’s beta period.

The beta version was launched during Mobile World Congress in February.

We talk to two very different companies at Mobile World Congress about their businesses and their relationships with mobile networks. Rebtel is a mobile voice-over-IP provider, while Mosaik Solutions produces mobile network coverage information.

Mark Bridge writes:

Back in the 1960s, Hertz was the number one hire car company in the USA. Avis was trailing a long way behind. Looking for a new advertising campaign, CEO Robert Townsend spoke to Bill Bernbach - the ‘B’ in ad agency DDB - and a few months later “We try harder” became the Avis tagline.

“Avis is only No.2 in rent a cars” the headlines admitted. “We try harder. When you’re not the biggest, you have to.”

It’s a message I was reminded of when I met Andreas Bernström at Mobile World Congress last month. Andreas is CEO of Rebtel, the world’s second-largest mobile Voice-over-IP company. With Skype seen as market leader for VoIP services, I asked Andreas whether Rebtel also needed to try harder.