Commentators who suggest that the days of bank branches are numbered need to look at the data on customer transaction activity that Commonwealth Bank provided in its interim results briefing this week.The shift in the way people are using their banks is definitely away from branches, but branches are where the high-value transactions are done.Over the past 10 years, internet and point-of-sale transactions have grown steadily, while branch and ATM transaction volumes have declined.CBA customers made 1.4 billion point-of-sale transactions (annualised) in the six months to December, compared with 700 million transactions in the 2002/03 financial year.They made 450 million internet transactions (annualised) in the December half, compared with 40 million transactions in 2002/03.More than 60 per cent of log-ins to the bank's online banking service, NetBank, are via mobile devices. In April 2012, 45 per cent of NetBank log-ins were via mobile.Customers made 80 million branch transactions (annualised) in the December half, compared with 130 million in 2002/03.And they made 290 million ATM transactions (annualised) in the December half, compared with 325 million in 2002/03.While branches only account for four per cent of the volume of transactions today, they account for 39 per cent of the value of transactions.Point-of-sale transactions account for 62 per cent of volume but only 11 per cent of their value.ATMs transactions account for 13 per cent of volume and four per cent of value.Internet transactions account for 21 per cent of volume and 46 per cent of value.