These are temporary ukrainian phone numbers or also called ukrainian numbers. This means that they are only available for a short period of time. Some ukrainian phone numbers last for several months, others only a few days.
Please do not use such a ukrainian number for important text messages such as passwords, private text messages to friends or for phone verification on websites. Anyone could take over your account by reading the text messages of these ukrainian phone numbers.
If you do not live in ukraine and still want to use a particular site or web that only accepts ukrainian users, it is necessary to have a ukrainian phone number to verify your account.
Most websites that require phone number verification have a limit on how often you can use a phone number. In this case it can happen that some of our ukrainian phone numbers are blocked. But this is not a big problem. Just use one of our other ukrainian phone numbers.