while i had the free year of unconnect access it worked great with an adroid phone, but never worked even a 1/4 percent right with an iphone.
If the service wasn't so expensive I would pay for it again. The voice text is the biggest thing, but remote start with my phone and send and go for the navigation were nice features also.
for a while I had the "no data" message pop up also and after a call to uconnect they had me do a reset of the radio and stayed on the phone with me to make sure that worked which it did. I would think a no data connection is an issue on the radio side, not your phone.