Wi-Fi problem Canon Powershot SX540 HS

[jangil]

My Canon Powershot SX540 HS camera has always reliably connected with my iPhone Wi-Fi so that I can transfer photos to my phone for editing, sharing, etc., even in remote locations throughout outback Australia.

But now when I try to connect my camera to my phone via Wi-Fi I get a message on my camera saying that no device was located. 
How do I rectify this problem please?

[Waddizzle]

While this video does not pertain to your camera model, but the procedure should be similar.

https://youtu.be/hJOs4rM087M 

[jangil]

Thank you for attempting to fix my issue. Unfortunately the problem has not been resolved as I had already completed the steps set out in the clip. 
Can anyone suggest another solution?