"Your previous carrier has advised us that the information you provided doesn't match their records. As a result, they're holding up your number transfer to Ting. Please confirm the information in the form below. Ensure it exactly matches what your previous carrier has on file and we'll try again!"
I have tried multiple ways on Ting's online form, using both my address and the one specified by Sonic support (Sonic net Inc 11 Great Oaks BL San Jose, CA 95119). Apparently this data is sent to Sonics partner XO Communications where my number is 'parked'.
Unfortunately Sonic employees are not empowered to see exactly what does not match and to resolve my problem, despite the fact that they can verify who I am with other information provided (latest Sonic ticket number is 5719253).
Judging by other forum posts this situation has been going on for years with other customers and Sonic management has not seen fit to devise a solution. For example, see DSLreports post https://www.dslreports.com/forum/r30248865-Tips-on-porting-phone-number-away-from-Sonic and Sonic post https://forums.sonic.net/viewtopic.php?f=14&t=4449&hilit=port+out+phone+number
Since I desire to keep this number, I am being held hostage by Sonic in the form of monthly rental in order to keep my number active. Count me as a very unhappy customer who is no longer recommending Sonic!
I have filed a complaint with the FCC and will see if that results in some action.