When connected to the internet from a smartphone or laptop, your device may have background apps running that require data. If you do not want this to happen, you may have to disable permission for background data usage in settings.
You can disable the quality limitation on YouTube temporarily via USSD or SMS.
SMS Enable limit – YTON to 102 Enable limit – YTON to 102
USSD *131*9# for 078 *131#3# for 072
IMPORTANT: When the resolution limitation is disabled, you will be charged for YouTube usage & plan validity will not change.