Dear crying. Are you in the UK?
I've had a look on the Mind website, under I need Help Right Now.
They say if you're having suicidal thoughts, you need to either:
Get your GP to refer you to a Crisis Team.
Go to A&E, and they'll refer you to a Crisis Team.
As you're without a phone, you can now contact NHS 111 online. Here's the link
NHS 111 - Error 500 [111.service.nhs.uk]