How to fix wifi problems on an iPhone?

iphone is a very good phone and it has many good features.I like the phone very much.But the one thing I don't like is wifi connecting problems.I tried many time and I can't connect to any other phone.I don't know how to fix it.I searched the solution.But still it is not fixed.Sharing nternet from iPhone to android or any other phone is difficult.How to fix wifi problems on an iPhone?

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