ok first and foremost welcome, i have an easy fix for you , as i too have a sprint phone and n810..
1. make sure you have unlimited data plan......

2. make sure you have a windows mobile phone.. ( any will do)
3. goto www.wmwifirouter.com
WMWifiRouter instantly turns your wifi enabled smartphone* into a wireless internet hotspot. Now you can use your laptop and any other device with wifi to get online and surf, email, instant message, and anything else you normally use the internet for!
-To use WMWifiRouter you need the following on your mobile device*:
Windows Mobile 5 AKU 3.3 or newer or Windows Mobile 6
Both a wifi and a cellular data connection
An installed and working version of Internet Sharing**
15 MB of free device memory

4. pair the devices , ( encrypt the connection)

5. go nuts!!! and surf .. the tablet loves this application...
any problems or issues reply to post and i will login your device to assist in installation.
have fun.....
Herve