TL;DR: There is no guarantee of performance, latency, or working at all whatsoever.
Video streaming works with either UDP and TCP so a cell phone being able to stream video is no guarantee that UDP is allowed on the cell service provider network.
Even then it is possible only some UDP ports are allowed on the network's firewall, and possibly to only some servers.
The network may also do traffic shaping to give priority to video call services over an unknown video game's UDP/TCP ports.
Cellular networks also have a very high latency compared to WiFi and wired Ethernet. On top of this cell phones will switch towers whenever convenient for them causing a short delay in data transmission.
It may work really well in a large metropolitan center at off-hours on some service providers in some countries and not work at all for practical gaming purposes in any other situations.
Something to consider is that right now (2017) even if it works well were you are located it's likely that the number of situations where cellular data network's high ping and sporadic delays will create lots of frustrated users, complaints, and bad ratings depending on your game's network requirements.