These are fake phone numbers for US residents. These are temporary us phone number. Some of them will expire in a few weeks, while others will only be valid for a few days.
Please do not use a temp us phone number for passwords, secret text messages to friends, or website phone verification. Anyone with access to your account could gain access by reading the text messages sent from these temp us phone number.
If you don't reside in united states but want to use a website or app that only accepts US users, you'll need a temporary us phone number to verify your account.
Most websites that need phone number verification have a restriction on how many times you may use it. In this case, it is probable that some of our temp us phone number will be banned. However, this isn't a serious concern. Simply call another of our temporary us phone number.