I have forgotten my Gmail password and have lost my phone SIM card.
How can I recover access to my email account?
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Through Google Account Recovery you can recover your password by providing a range of details (such as account creation date, frequent contacts, label names, etc.). I've done it several times and out of 4 times it worked twice (the other times I didn't know enough information). The last time was about a month ago so likely the system didn't change since then.
Work your way through the first or third option, it should be somewhere in there.