To be able to show a VisualForce page TAB with connected application, you need to make several settings on your iPhone.
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Go to iPhone > Settings > Salesforce and turn on the “Allow Cross-Website Tracking” option.
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If you want to access Salesforce from Safari, check the following Safari settings:
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iPhone > Settings > Safari > Prevent Cross-Site Tracking is OFF
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iPhone > Settings > Safari > Prevent Cross-Site Tracking > Advanced > Experimental Features >
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Block top-level redirects by third party iframe is OFF
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Disable Full 3rd-party Cookie Blocking is ON
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