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Apple iPhone users who get a dodgy signal when the device is in their left hand should switch to the right to boost service.

According to research, lefties block the mobile phone’s antenna and disrupt reception with Apple’s iPhone 6 Plus the most vulnerable.

A simple move to the right, clears the blockage and can mean the difference between a clear conversation and cries of “you’re breaking up”.

The study found four of the most recent iPhones were the worst performers when calls were made or received on the left with the 6 Plus showing the signal was 20 times stronger when used on the right.

And the £599 handset was 100 times weaker when used on the left compared with being used as a hands free device in a car.

Danish research led by Professor Gert Frolund Pedersen of Aalborg University revealed Microsoft and Samsung handsets were the best for signal strength regardless of which hand they were in.

(Image: Getty)

But the iPhone 6S, 6S Plus, 6 and SE models were the worst on the left while Huawei and HTC models were the worst on the right.

Prof Pedersen tested 26 different models and said: “Our findings show that there is a surprising change in voice-call performance when you switch hands.

“It’s enough to make the difference between a successful and unsuccessful call.

“People always think about things like the camera and storage when they buy a phone but they can’t easily access data on antenna performance which will often be more important day to day.”

He is now calling for phones to carry a ratings mark so shoppers can tell at a glance if the signal will be stronger on the right or left.

Worst for signal on the left

iPhone 6S Plus iPhone 6S iPhone 6 iPhone SE LG G5

Best on left

Doro PhoneEasy 530X Microsoft Lumia 640 Microsoft Lumia 650 Sony Xperia Z3 Compact Xiaomi Mi5

Worst for signal on the right

Hwawei P9 Microsoft Lumia 950 HTC10 iPhone SE iPhone 6S

Best on right