My iphone 3gs has trouble connecting to the internet?

I just got an iphone3gs 2nd hand from a friend just until my contract goes up because my bb broke and its getting easily confused when I thought apple was supposed to be an intelligent brand?

I linked it up to my home Wi-Fi which works great but when i'm out of range of my Wi-Fi the phone doesn't recognise this and automatically start using its own mobile internet. How do i get it to do this, the only way I get it to link to its own internet is by turning it on and off again when outside the house, any ideas?

Check your APN settings (located under the "settings menu"), and see if they are set properly for your carrier. If you need help finding out what the APN should be, contact your carrier to get the APN settings that you need.

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