Lady Gaga is scared of mobile phones.

The'Telephone' hitmaker is reportedly terrified of getting a brain tumour from using a portable device and now insists a member of her entourage holds her phone a short distance away from her whenever she has to make a call.

She then listens to her calls on the speakerphone.

A source said: "There have been various reports suggesting mobile phone use can increase your risk of developing cancer and brain tumours and even though there's no firm evidence, it really freaked her out.

"She's now insisting that whenever she makes a call, one of her team keys the numbers into her phone, then holds it up to her face so when she speaks it isn't too close to her head.

"She then listens to her calls on the speakerphone."

According to the insider, the request is the latest in a series of bizarre demands from the eccentric singer.

She is also said to ask members of her security team to carry her to various events because she has only designated a certain amount of time each day to walking.

The source added: "Everyone around Gaga tries to tolerate her annoying and weird behaviour because they know it's likely to be just another phase."