Just as a point of reference, the 2 addresses are literally seconds from each other.
While him tossing his own phone is an interesting thought, I do not believe the evidence supports it, regardless of which direction the address numbers climb (but they increase in a Northwardly direction) ... because they are just too close together for it to be plausible.
It appears after they pulled over for 14 minutes that TB's data was accessed and then immediately the phone was shut off -- maybe a slip of the finger hit the web browser or something before his killer shut it down and pitched it as they headed North toward the farm/hangar.
I can't think of any reason they'd have pulled over for 14 minutes other than to kill him. I'm sort of inclined to believe MS' recollection of events -- not entirely, but most lies have elements of truth in them ... less the "I was so scared" crap.
It's a non-residential stretch of road, so perhaps it was opportunistic?