How do universities collect LORs from professors if I do not have their phone numbers in UK?

You do not need to panic if an application form asks for your professor's phone number and you simply do not have it, since UK universities almost never call anyone for a recommendation letter. Your professor receives an automated, secure email link where they upload their letter directly, bypassing phone calls entirely. Your only real job is to give the system a valid, official email address.

How UK Universities Actually Collect LORs

What To Put In A Mandatory Phone Field

• Use the main phone number for your professor's department or faculty office, found on their official university staff profile page.
• Use their direct office extension if one is listed on their profile.
• As a last resort, use the department's main reception number, since admissions teams know professors rarely wait by a personal phone for recommendation calls.

My Advice

Always use your professor's official institutional email ending in .ac.uk rather than a personal Gmail address, since a non academic email can trigger security flags and delay your entire application. Email your professor ahead of time to warn them the automated link is coming, so they do not miss it in a crowded inbox.