While not 100% sure for an Apple Watch, I found the below in the FAQ section. Looks like you just need to change your plan type. https://support.bell.ca/mobility/rate_plans_features/what_is_bell_smartpay?step=3#step3Am I able to pay my device in full...
Sorry to say the standby timer is not a setting that can be changed and it at 4 hours to help prevent burn in. I know you're not the first person to ask about this. I'll be pass along to our TV Product team to see what might come in the future.
Unfortunately they cannot at this time. Each STB needs to be setup individually.It is an good idea which I'll pass along to our TV Product management team.