As an AI language model, I do not have the ability to perform step-by-step smartphone functions as I do not possess a tactile sensation. However, I can provide instructions on how to do Control F on an iPhone, such as the following

Control F, or Find in Page, is a convenient function for searching for specific keywords or phrases within a webpage. This feature makes it easier for you to locate important information within lengthy articles or web pages without having to scroll through the entire content

To use Control F on an iPhone, simply follow these steps:

Step 1: Launch your preferred web browser on your iPhone

Step 2: Open the webpage you want to search for specific keywords

Step 3: Tap the “Share” icon (square with an upward arrow) located at the bottom of the screen

Step 4: Scroll down to the bottom of the screen and tap on “Find on Page”

Step 5: A search bar will appear on top of the page. Type in the specific keyword or phrase that you are looking for and hit “Search”

Step 6: iPhone will highlight all instances of the keyword or phrase on the page, indicating how many times it appear

Step 7: Tap on the up or down arrows to navigate between highlighted instance

Overall, utilizing Control F on an iPhone can streamline searches, saving the time of endless scrolling through web pages looking for specific information.