For me, it depends on wheather my phone is getting a Cell tower signal. If my signal is weak, which often happens if I'm in a building with alot off walls, Uconnect will not get the message to your truck.
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That's a big thing too, and it's not just where you are located when you send the signal. The truck has to be someplace too that can receive the signal. I don't know that it would work if for say your truck is in an underground parking garage.
That said, I've been hit or miss with the app. I can be in my house and the truck outside and the app will not be able to connect to the truck. It's just not a very reliable service. And when it does work, I've seen it take 2 minutes or more just to send the signal to lock the doors. I'm not impressed at all with the UConnect app and service.