Sero and Sprint Navigation

[knlmwq]

I am coming from a touch pro 1 and sprint navigation only worked for free on my very first use. After that I was asked to either sign up for 9.99 or get a one time use for 2.99.

Now on the touch pro 2 I have yet to be asked if I want to sign up for 9.99 and sprint navigation has worked for the past 4 days. Will it eventually stop and ask me to sign up? Is everyone else that has a SERO account being charged for sprint navigation or getting it free? I guess i would like to know because I wont waste my time installing tomtom if sprint navigation will always work. Thanks a lot