This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to keep your obsolete iphone
Check yourself.
Do you have to have the latest iphone? If the answer is " yes ", this article isn't for you. If the answer is either " no " or " yes, but i can't afford one " then there are ways to prolong the life of your iphone until you can afford to buy a new one or it dies.

OPTIONS:
(I). You have to be comfortable, patient and disciplined in using an older iphone. Comfortable with yourself, patient with the iphone and disciplined on how you use the iphone.
(II). Check your cord and batteries at the back of your iphone. Charge your iphone with an adapter of your choice before you use it.
(III). Unpack your iphone from its original casing. It's best to just put your new iphone in its original casing.
(IV). Remember, however, that some functions may not be easy, such as your speed, operation, and intended service. Start up your iphone and buy a (if you have one) flash drive.
The answer is:
(I).