Why won't my iphone 4 cnnect to 3GS?

I'm on Orange and I checked my data allowance; I've barely used any of my 1GB, so that's not the problem. Wi-Fi works fine. Yet when I try to connect to 3GS, no matter where I'm, it won't connect (despite the 3GS sign in the top left indicating a good signal). What could be the problem?

Because apple died with steve jobs

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