@Bailey122
If you haven't already you need to call Sky and report the lost phone to them and ask them to send you a replacement sim card.
And you might want to register the lost device here:
https://www.immobilise.com/
Depending what phone you have then have you tried to see if you can track it:
https://support.apple.com/en-gb/HT201472
https://support.google.com/accounts/answer/7177579?
https://www.samsung.com/uk/apps/smartthings-find/
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