Commonwealth Bank invested A$192 million in its core computer systems revamp last year - 16 per cent of its total investment budget - but, with that program now completed, the bank will now be able to redeploy effort and investment "innovating at the edge," according to CEO Ian Narev.Asked where the next major technology frontier lay, Narev nominated mobility, while also giving a nod to big data analysis. Demand for mobility was a key driver in why the bank had spent $1.1 billion over six years and employed 1500 people to revamp its core banking platform, said Narev.He said there was little point in offering mobile functions if a customer then had to wait 48 hours for a mobile transaction to take effect.Narev said that as a result of the core banking completion CBA was the only major bank able to achieve real-time processing, although he said that other banks might be able to feign something similar. He declined to contradict NAB's claim made earlier this year that it had the most advanced technology revamp plans for the coming decade, but, instead, pointed to CBA's success in moving 14 million accounts off a 40-year-old legacy platform, describing it as a "hairy thing" which CBA had now concluded."The one thing I will say about the core banking investment is that six years ago we made a multi-year commitment and pretty much come hell, shine or whatever it was going to be; we were going to keep doing that because you don't pull out of a project like that in mid-stream.""What we do have obviously now is a bit of flexibility. There's not a single project anywhere near the scale of the core [which] is going to take a big chunk of the investment spend every year for five or six years."Demonstrating its progress to date with mobility, CBA claimed yesterday that its CommBiz mobile service, launched in March, had recorded 36,000 log-ins and more than 2000 activations to date - the latter figure possibly being a disappointment. Meanwhile, the bank's Kaching mobile payments system has secured more than one million downloads and has been used to process more than $9 billion worth of transactions.Its progress with the Pi, Albert and Leo point-of-sale platforms, however, seems sluggish, with the bank yet to pilot the Albert tablet device, despite this being announced over a year ago.In the meantime, alternative tablet-based point of sale systems have emerged from organisations such as Impos and Smartpay.CBA acknowledged that it expects to face competition both from traditional financial service providers and new players equipped with technology-enabled business models.Commonwealth Bank also noted yesterday that it was the first bank to complete transactions on the new national e-conveyancing platform PEXA (Property Exchange Australia). Narev said this had delivered "process benefits for our business... and, from what we hear, for our clients' businesses", although he did not quantify this benefit.