When I bought my iphone i purchased the 16G phone and my phone is already requiring more storage. Do I buy the extra storage or buy a new sim card? When I go into the manage storage on my phones settings it says that I have 4GB and 5GB free were given. Below there is upgrades. Do I buy the upgrades?

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Hi! I am new the iPhone and already I love it. I purchased the 4s. I have had a few issues but have been seeing on the news that it will be fixed so I am very satisfied. Hoping to make new iPhone friends and make a lot of use out of my phone. I would love to know about all the great apps that I...