I apologize that you are having this issue with your data being slow. Can you please provide us with more information? Is this 3G or 4G? Can you provide a Zipcode and the nearest major cross streets? Is this happening at one place or all the time? Any information can help us in resolving this issue.
There are a million people making this same complaint here:
It's in the press:
How much more info is needed to "resolve" the issue?
I am also having poor data connection and frequently get a 'connection time out' notice. I am very disappointed as I came over from T-Mobile but am seriously considering going back. From what I have read Sprint is the 3rd largest wireless carrier and T-Mobile is the 4th so you would think Sprint's data service would be better but it is not. I had the Nexus One on T-Mobile and I had blazing fast speeds. Seriously having buyer's remorse with this Nexus S 4G. Unsure if it is the phone itself or a carrier issue. I've had the phone for 3 days and have never seen all 4 bars light except for when it is connected to WIFI. If it doesn't get any better over the next week, I will be returning.
Honestly, I wouldn't even wait. The issue is the phone. Samsung used really crappy CDMA radios with this device. My 3G connection is always spotty and I live in a really good coverage area. 4G works just fine for me, but the 3G and Wifi radios are just terrible.
Just return the phone before your 2 weeks is up, seriously. Take the phone back today before they lock you in for 23 more months. Try a different phone, like maybe the EVO 3D or the EVO Design 4G. Steer clear of any and all Samsung phones. I had the EVO 4G for about 1 year and LOVED it, sold it to get the Nexus S 4G because I wanted updates and the original EVO is no longer supported by Sprint.
Again, don't waste any more time, go and return the phone today.