What is the grammatical error in the following sentence:

However, in the mid 2000s technology and smart phone usage skyrocketed; it increased beyond any previously expected amount, model, or trend.

The semicolon after"skyrocketed" should be deleted.
There should not be a comma after "However".
The phrase "mid 2000s" should be hyphenated.
The word "it" should be capitalized since it follows a semicolon.

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