What is the best plan for the iPhone 4S?

I have never owned a smart phone before, nor have I ever used one. But my phone is available for an update (on Verizon), and I found out you have to have a Data plan for it. The plans are:

-$30 a month for 2GB
-$50 a month for 5GB
-$80 a month for 10GB

Now I'm a YouTuber, so I plan on using the internet a little bit, and apps a lot. Including Siri. But I don't know how fast that stuff builds up, so I'm trying to figure out the best plan for me. I want more memory, but the plans are so expensive, it's ridiculous. So I figured I would ask someone who knows more about this stuff than me. So if you know, or have a recommendation, then please let me know. Thank you!

Also, how much do apps, Siri, and itunes take up? Because those will be my mainly used things. Mainly Siri, and apps.

Added (1). ALSO! Please TELL ME IF SIRI IS PART OF THE DATA USAGE! I'LL USE THAT AND APPS MOSTLY PROBABLY!

If you use it only for browsing means use 2gb plan
or want to download means use 5gb plan
or u always will be on phone means use 10gb plan

2GB for $30/month is plenty for those things you mentioned. I used Youtube, Facebook, Safari ect.everyday and have the 2GB plan and I never go close to the limit. Only 5% of the users with the 2GB plan go over the limit.

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