Text code not received

05/01/2018 12:18:11
I've been using the online self assessment facility for years and never had a problem before. I logged a few days ago to make sure it was working and all was OK.
This morning I tried to log in but have not received the necessary code by text message. This was about 4 hours ago.
What happens now?

Re:Text code not received

05/01/2018 15:19:55
I am sorry you are having problems. Please call the online helpline on
0300 200 3310
See link. https://www.gov.uk/government/organisations/hm-revenue-customs/contact/self-assessment
Kind regards

Text code not received

05/01/2018 15:57:45
Apply again. I have had several clients not get theirs and they just apply again.