On Google+, Google Adwords team officially announced that they are going to Combining click types for “mobile click-to-call data” and “Mobile phone calls”. That means, you will not going to see the separate data for these two metrics to know your ad behavior.
They also said “Based on feedback from hundreds of advertisers, the data will now be combined and aggregated under a single click type: “Mobile clicks-to-call.” As a result, you’ll no longer see a row for the click type “Mobile phone calls.”
This update will go live on September 29th, 2014
Here is screenshot shared by them on Google+ :