Did you just buy a new iPhone but all your contacts are still saved on your old Android smartphone? Don't worry, this situation happens to many when switching operating systems.
An iPhone in good condition, with a battery at its fullest potential, can usually last an entire workday. However, battery life depends significantly on device usage and the applications running.
You have a strong suspicion that a friend is spending too much time on Instagram, particularly engaged in video calls, and you're looking for ways to confirm this doubt.