Had email from a coworker today that made reference to two apparent improvements in Treo 650 stability for Cingular customers. He gave no references to information about these, nor have I been able to find anything about them online. Does anyone else know about these that can offer some insight, or whether this is just speculation and straw-grasping?

In particular, he mentioned that the following two changes improved his Treo's stability:

(1) Install 1.2 Cingular Service Pack (requires hard reset)

(2) Replace SIM with latest version. Card number starts with 890141