KBS 2TV “Gag concert”s gagwoman Park Jiseon has mentioned on 9 February 2011 Gag concert that she got Taemin’s mobile number.
At first, she doesn’t have it until Taemin said “Noona, I changed my mobile number” and that’s how she got it.
Fyi, Now Jiseon has all SHINee’s members’ mobile numbers except for Key’s.

KBS 2TV “Gag concert”s gagwoman Park Jiseon has mentioned on 9 February 2011 Gag concert that she got Taemin’s mobile number.
At first, she doesn’t have it until Taemin said “Noona, I changed my mobile number” and that’s how she got it.
Fyi, Now Jiseon has all SHINee’s members’ mobile numbers except for Key’s.