I understand what you mean, in the explanation part I just injected a SQL payload for the server to sleep for 40 seconds, if I showed a screenshot it wouldn't show anything like a syntax error or something like that. The server slept for 40 seconds so I went to sqlmap to see if it really was a time based SQL injection, for this reason I jumped to the terminal without showing a print of a SQL error as I mentioned above an incorrect syntax. About my cell phone, I just told that I had discovered this flaw by it because it was the only device I had, if I was using a computer it wouldn't make any difference. What I wanted to get across in this article was what I did to find this site that was vulnerable to SQLI.