Upgraded to 4.3.5 and now have no cellular. Full bars, AT&T, 3G are showing. Wi-fi is OK but not cellular. Tried different suggestions from google search (Turn off/on, toggle airplane mode off/on, toggle roaming off/on, reset network settings, reset all settings) Called AT&T support and ran thru basically all the above again. They "re-registered" my data plan for the iPad, no success. AT&T even had me Erase all content and settings (basically back to out-of-the-box iPad) no change. iPhone upgraded to 4.3.5 and no problem with 3G, just iPad I think it is caused by 4.3.5 on iPad only. Any suggestions?