Phone number 9999?

In the UK there is no such number. It will connect after the third 9 and the fourth doesn't do anything. So if you are in the UK (or anywhere else that uses 999) you did ring the emergency services. I shouldn't worry about it, as you rang off immediately they will have just assumed it was a wrong number. It's the people who ring with trivial complains they hate:

Back in 2010, Devon and Cornwall police released a list of inappropriate calls they had received, the worst of which was a citizen asking if their Sarah Lee gateau would defrost in the freezer after a power outage. And last year, a man in the West Midlands called 999 to complain that his driving instructor had arrived late. In June, a woman called 999 because the sprinkles on her ice cream were spread unevenly.

(Information from The Independent.)

heckinworm wrote:

‘9999’ was input into my phone before the call button was pressed, so does this mean I called the emergency services or not? Just want to be 100% sure!!

Yes, your phone would have showed all the numbers you pressed. However, the actual phone system would have stopped accepting input after the third number. You called Emergency Services.

Why does it matter, though? Calling a wrong number isn't dangerous (from a technological standpoint).

999 in the UK is for an emergency - also 911 to mirror the same in the USA. In the UK you will be asked which service you require (Fire, Police or Ambulance).

I wouldn't have thought so for a moment. It's the people who actually call with nonsense, like the examples above, that cause problems. Yours was plainly unintentional.

heckinworm wrote:

I just got scared that the police might show up or something! It’s been 15 minutes now so I think I’m okay.

I think you're okay. Everyone makes mistakes.

Same difference: your phone dialled four 9s but it connected after the third. Stop worrying about it.