Receive 20 SMS on different phone number

Hello Goal : pass 20 SMS validation on registration. A website require me to receive a code by SMS, and then copy that code to validate my account. So: 1) You log on a website (i give login/password) 2) You insert a mobile phone number ( must be different each time) 3) You receive a code by SMS 4) You copy that code on the website, and logout. TO SUCESS THAT MISSION, YOU WILL HAVE TO VALIDATE THE 20 ACCOUNTS, AND TO DO SO, YOU LL NEED To RECEIVE CODE on 20 DIFFERENT CELLPHONE.