Attacks on 5G masts in England, Wales and Scotland have been triggered by conspiracy theories claiming that the deployment of 5G networks has caused or helped accelerate the spread of coronavirus.
A spokesman for Mobile UK: "Theories being spread about 5G are baseless and are not grounded in credible scientific theory. Mobile operators are dedicated to keeping the UK connected, and careless talk could cause untold damage.
"Continuing attacks on mobile infrastructure risk lives and, at this challenging time, the UK's critical sectors must be able to focus all their efforts on fighting this pandemic."
Nick Jeffrey, the chief executive of Vodafone UK, confirmed that one of the targeted sites serves Birmingham's Nightingale hospital.
He wrote on LinkedIn: "It's heart-rending enough that families cannot be there at the bedside of loved ones who are critically ill.
"It's even more upsetting that even the small solace of a phone or video call may now be denied them because of the selfish actions of a few deluded conspiracy theorists.
"Imagine if it were your mum or dad, your gran or grandad in hospital. Imagine not being able to see or hear them one last time. All because you've swallowed a dangerous lie."