i lost my iphone how do i lock it to avoid it being used

PMeme Said:

"i lost my iphone how do i lock it to avoid it being used"

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Modify your Credentials:

Having lost your device, consider modifying your credentials. Elsewise, someone has access your info.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

PMeme Said:

"i lost my iphone how do i lock it to avoid it being used"

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Go Here: erase a device - Apple Support