@Miteshbhai
If you contact Sky to let them know you have lost your phone they will block it and if you ask them they will sent you a replacement sim card for no charge that will have the same number as the lost one.
And you might want to register the lost device here:
https://www.immobilise.com/
Depending on what phone it was, have you checked to see if it can be tracked:
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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