What render setting should i use?

When i render My clip on and send them to youtube i can't watch them on mobile?
I can on computer but not mobile(i have iPhone 4s)?
Which render setting should i use?

After you render a video in any format.
Youtube render it again before posting on website.

So if it's plays on the YouTube. It should plays in any device with internet connection.
Because YouTube player is universal that means it plays every where.

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