My nexus s 4g is being a complete pain.?

My phone was completely fine earlier today, had 3g, and 4g coverage. I was out and about and I just lost the coverage completely. I only had 2 bars. I still only have 2 bars. And I get great 3g at my house. I'm waiting for the ICS android update.. do you think that will change anything?

Also, I called sprint and they said that there was nothing wrong with my phone, I tried to explain. But whatever.

Any solutions for right now? I can't have wi-fi available when I go everywhere.
I know that i'm not going to have perfect connection 24/7. In all of the usual places where I have great connections, I don't. My mom has service, and my sister does as well. They both have sprint.

My phone won't perform simple tasks without being connected to wifi.
 
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