Mobile network EE say a service outage last night has now been resolved and has advised users to switch their handset off and on again if they are still having problems:
Full network service has now been restored. The problem was fixed overnight. We apologise for the inconvenience caused to customers affected
Please restart your handset if you are experiencing any more problems, or visit the EE community for more info: http://t.co/K7nFte2CFY
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The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.