All BT controllers cause interference to some degree. How much depends on the controller and the phone, a wifi repeater helps a bit to reduce the issue.
I am sincere, sometimes yes and no! but it depends a lot on the area where you fly ... I have a video of a range test at 308 meters that with this T1d controller and a Samsung Note 3 neo, I get a smooth video even at that distance. (field open in the countryside). In my opinion it also depends on the type of mobile phone you use .. but I'm not sure.Do you get video interference using the bluetooth connection?
I think raulvolador had problems with the t1s entering sleep mode or switching midflight as well. There is a thread a bout it somewhere here
I found the T1d responsive and quite good but I had wind, snow and cold today, so hard to give it a fair chance.I have the td1 with my iPhone. I’m impressed how it works. Very little lag if any.