O2 has confirmed that using the FaceTime video calling application will not deduct any minutes from an allocated allowance, as pricing details of the iPhone 4 continue to emerge ahead of its launch on 24 June.
An O2 spokesman said that FaceTime currently operates over Wi-Fi connections only, and that it is unknown whether the Skype-like application will be made available over 3G.
"[Wi-Fi only FaceTime] is an Apple setting, and you will have to talk to them about any future plans," he said.
It is likely that FaceTime will be implemented over 3G in the future, at which point charges will apply.
Skype-to-Skype calling via 3G is free until the end of 2010, subject to operator data charges. After this, there will be a small monthly fee, according to the firm.
Video calling on mobiles has failed to take off, partly owing to high prices. Three is the last major network to invest significantly in this area.
However, Apple's entry into the market could mean that video-calling is here to stay. The company had not confirmed the details of FaceTime at the time of writing.
NatWest outage comes a day after Barclays' IT systems shut out customers and staff
The ICO is concerned with AggregateIQ's retention and processing of data used in the Brexit referendum
Map selection, quick menus for grenades and healing items and automatic reload coming in PUBG update #22
Could be used for everything from search-and-rescue robots to wearable tech