I’m frustrated

What do I do when my phone says "Invalid SIM card" ?

At the top right corner where it usually says how much service i have it says "SOS" and I cannot message anyone. Also whenever I unlock it it says , "SIM card is invalid and needs to be unlocked". I do not know/have the password for it to be unlocked. Lastly at the top middle where it usually says "koodo" it says "invalid SIM card", my warranty was just up a couple weeks ago and if you could help in anyways that would be great, thanks.
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