Your carrier might, most do, throttle streaming video. Some are 480p or 720p. This can cause buffering or issues if trying to play a higher res video. One way to tell is do a Speedtest on http://fast.com This is Netflix’s Speedtest site and most plans consider this streaming. It should show you your streaming download speed. Some carriers, AT&T for one, have a setting you can adjust and change the streaming bandwidth.