This morning, Microsoft published a partial changelog for Windows Phone 8.1 Update 1. The listing is incomplete because it misses things like Cortana's Bluetooth integration or the new Store Live Tile. However, one area it did get right is the ability to select multiple entries on messaging, contacts and even phone calls.
Previously, in Windows Phone 8.1 and below, users could either delete everything in the call-history or delete one by one. This approach lacks the granularity that many users desire, so the ability to bring up the familiar multiple-select check boxes goes a long way to improving control over one's content.
To see the change yourself, you can just head into the Phone app and tap the ellipsis '…' near the bottom. Found in the middle is now 'select calls,' which previously read as 'delete all.' Once engaged, checkboxes should appear on the left side, letting you go through and choose multiple phone calls for deletion.
If you still would like to delete all of your entries, choose 'select calls' and now bring up the ellipsis '...' again. An option to 'select all' is now available, letting you delete all calls.
Features like call duration (details), block number and add to speed dial can be found by a long-press on a call entry. Those are not new, as they came with the original release of Windows Phone 8.1 though they are still good know in case you missed them.
Overall, the ability to select multiple calls is a minor refinement, but it helps to make people's lives easier when using Windows Phone.