TS1398 iPhone 4 does not connect automatically and does not remember wifi password

After being idle for a while, my iPhone 4 goes off wifi and when I am connecting manully, the phone does not remember the wifi password. I have a iPhone 3 and 5 where this is not a problem. Can this be linkes to the phone company you use? The iPhone 4 has a different phone company than the other phones. Can anyone help please?

Hi Damien,
Thanks for your reply.
I had not created 2 separated wireless network. The airport extreme has had create wireless allowing it to be extended and the airport express has had it to extend since day 1.
The only device that does not connect to the airport express when it is far from the airport extreme here is the iPhone 4. I've tested 2 Windows based computers, 2 Macs, 1 Samsung TV and 1 Android phone and they all are able to connect to the airport express when the signal from the airport extreme is weak (please take a look on the screen shots on the original post).
The screenshots of the 2 devices' wireless set up can be found below:
Airport Extreme
Airport Express
I have seen other people here on the Apple discussions complaining about the same issue with their iPhone 4 and iPad: would it be a iOs problem?
Regards
Gilson

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My iphone has always connected automatically and without problem to the wifi at work i.e. BTBusinesshub and at home BTHomehub but yesterday it would not connect at work. It is ok at home but again today at work it is not connecting. It appears to try but is not connecting, please help.

You can try doing a reset, hold down the home/power button until you see the apple logo and then release, then wait for the phone to boot back up - then check wifi - if that doesn't work then
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Hi, Carmen.
Thank you for visiting Apple Support Communities.
If you need to reset you security questions, do not know the answers and no longer have access to that email account, see the last sentence under Note in step 5.
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I am trying to connect with a friend via FaceTime from my IPad to his IPhone and it will not connect. We are both on wifi. What are we doing wrong?

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TS1398 iPhone 4 does not connect automatically and does not remember wifi password

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