Patients in Berkshire were among those affected by the cyber attack that struck dozens of NHS trusts across the country on Friday.
Royal Berkshire NHS Foundation Trust, which runs the Royal Berkshire Hospital in Reading, was one of those targeted by hackers.
Part of its phone system was brought down, meaning many people were unable to call the hospital or faced severe delays in getting through.
Its IT system used for discharges was also hit, meaning staff had to rely on their paper system.
However planned appointments and emergency services were able to continue as normal over the weekend.
Mary Sherry, chief operating officer and deputy chief executive of the trust, praised staff for their work in keeping the hospital running.
She said: “I would like to thank all our IT, clinical and admin staff as well as our on-call teams involved, they did a fantastic job of handling the situation and maintaining an almost normal service throughout.
“The good news for our patients is that we continued to run planned appointments over the weekend and maintain emergency services, despite the challenging situation.
“We continue to assess systems to understand the full impact of the cyber attack and follow through on all aspects of the recovery required to our digital systems.”
Anyone who needs to contact the hospital urgently is asked to call 0118 322 5111.
At this stage it is not known who is responsible for the cyber attack, which hit not just the NHS but companies and individuals across the world.
Computers were struck with ransomware, a program that locks users out of files until a ransom is paid – in this case $300 per infected machine.
The ransomware said if this wasn’t paid within seven days, the files would be deleted.
Home computers are thought to be at low risk from this attack, but security firms are urging people to make sure their firewalls and anti-virus software is up to date.
Berkshire Healthcare NHS Foundation Trust, which runs the West Berkshire Community Hospital, was unaffected, and its minor injuries unit has been operating as usual.
A statement from the trust said: “Our strong security measures mean we have been unaffected so far and all of our services are running as normal.
“We will continue to monitor the situation and will provide further updates should the situation change.”
Basingstoke and North Hampshire Hospital was targeted though, affecting its x-ray facilities.
Services were reduced while the machines were repaired, with the walk-in service being shut entirely today (Monday).
Appointments and emergency services continued as normal.
Great Western Hospital in Swindon, the John Radcliffe Hospital in Oxford and Andover War Memorial Hospital didn’t report any problems.