When you're trying to login internal Turkcell pages, see SMS OTP option selected by default.
21st Century Mobile
https://loaysa.com
alexei.volosozhar
https://freesmsreceive.org
Prashant Pokhriyal
roma.tsvyk
https://www.binaryboot.com
2111072
David Luu
Oliver Dickins
danielerez
https://quackr.io