Cellular Data and Wifi Problem

Hi Guys. I wonder if you can advise?
I have an iPhone 4S on a monthly contract with an unlimited cellular data plan. The phone is set to Settings-General-Cellular-On= Cellular Data On, Enable 3G On, Data Roaming On. Also, Settings-Wi-Fi On-Ask To Join Networks.
My phone finds and connects to my home network when I come back to the house but when I'm out it will not connect to any other Wifi network. I have tried all of the resets and stuff but no good. When I try to connect to a new network the Login page comes up but no details and then the remote server times out. If I go to Safari and try to access a web page I just get the pop up asking me to join a Wifi Network and when I do an error popup shows saying that the network is unavailable.
Messing around with the phone I have found that if I turn off Cellular Data (web, 3G, email push using wifi only) I can access other networks but, of course, have no 3G cellular data service unless I am in a wifi hotspot.
Is there a way to make the phone switch to cellular data on 3G when out of range of wifi and back again?
Anyway, if anyone can advise it would be appreciated.
Regards
Paul

UPDATE:
Turning off Cellular Data at a local wifi spot (not used before) didn't work this time. However, turning off Cellular and going into Settings-General-Reset-Reset Network Settings then acquiring the wifi network did. I could then turn Cellular Data back on and use the wifi spot.
Will try at another hotspot soon to see if the phone will automatically ask to join the network and allow me to do so without doing the above, as I don't want to be re-inputting other network passwords etc over and over again.

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