From the businessman's best friend to an all-round consumer heavyweight, the BlackBerry has certainly made some giant steps over the last couple of years. And if you want that underlined, check out the new range of smartphones now offered by O2 on pay-as-you-go.Five handsets are being offered on a pay-as-you-go deal, but the three headline acts are the BlackBerry Pearl 3G (which has only just landed on contract), the BlackBerry Bold 9700 (around a year old now) and the BlackBerry Curve 8520, which is of similar vintage to the Bold. Despite the age of the last two, the BlackBerry operating system hasn't changed much since, so don't worry too much about that.Prices are £250 for the Pearl 3G, £150 for the BlackBerry Curve 8520 and a hefty £350 for the Bold 9700, all with inclusive BlackBerry Messenger and 500MB of monthly data, but only if you top up with a minimum of £15 per month (which also includes 500 free texts). Not quite pay-as-you-go for us, but at the same time, not a contract deal either. Something of a halfway house. If you want to go beyond halfway, top up £30 a month and you'll get unlimited texts. Mind you, £30 a month would get you a decent contract deal and without the upfront outlay for the phone.Talking about the new offerings, Jonathan Earle, Head of Consumer Marketing for O2 UK, said: 'O2’s new Pay & Go tariffs for BlackBerry smartphones will bring all the benefits of BlackBerry to even more of our customers. With BBM being used more and more across the world, now anyone can share their PIN and get chatting.'