Apple and Samsung have issued alerts about faults on some of their phones.
Apple has begun a replacement programme for some of its iPhone 5 handsets that have a faulty sleep/wake button.
Separately, Samsung has revealed that some of its flagship Galaxy S5 handsets have been shipped with a non-functioning camera.
It said anyone who bought an S5 with a faulty camera should contact Samsung’s customer service or their mobile operator to get the phone replaced, BBC informs.
