A recorded message about coronavirus has started playing instead of the caller's ring tone.
They are among a number of galleries and museums to shut due to the coronavirus outbreak.
Experts question whether it is possible to make thousands more respirators in the UK in the short-term.
The US president used the term despite warnings to avoid stigmatising one region or group.
Coldplay, Yungblud and Christine And The Queens are among the musicians streaming makeshift gigs.
There were reports of issues with voice calls at a time more people are working from home.
The move comes a day after Prime Minister Boris Johnson advised people to avoid public venues.
The widely derided film version of the hit stage musical gets six "awards" including worst picture.
Police say a vessel could have been used "to access and leave" the Christ Church Picture Gallery.
The move, which is not related to the coronavirus outbreak, will lead to 531 shops being shut.