@Diana2010 I presume that's the 1-st state form the table I posted. Here's a initial setup video that might help you to resolve the issue.

@Pradeep_Singh So iPhone can connect with the router only when its close to it, but connection fails when you're on a certain distance. No other device (laptop, mobile, etc.) experiencing this...

@fakaf Make some notes about your router configuration. Hard reset the device - method 1 and re-configure from scratch. Configure only basic settings like wireless settings, router password, network...

@Diana2010 Here's an explanation from your user guide (Chapter 2.1):

@Mricho Here's a video on how to setup your wireless router in general. If you post your router model and it's HW version (on the bottom sticker), probably I could post an installation video for that...

@Pradeep_Singh Do you receive any error message when trying to connect the iPhone ? What are your wireless security settings ? Try these to see if that will resolve the problem: If the issue persists...