About a month ago, I started having connection problems with my phone. I had just added a few applications from the development repository. One of them had to do with extending battery life by ceasing connections when the phone was not in use (I will get back to this application in a moment). Today, I tested my phone.

Out of 10 calls (all made within 3 minutes), 3 were Network Error, 3 were Connection Error and 1 was Network Busy error. 3 calls went through. These were all to Google 411. They were made from inside and outside of my house. I was able to call my phone from another mobile number 2 out of 4 dials during that time as well.

History
Here is what I have done/tried to this point:

I uninstalled ALL of my applications and deleted ALL of my catalogs. I still had connection errors.

I backed up my phone completely.

From the Settings menu, I re-booted the phone to factory settings I still had connection errors.

From the Settings menu, I cleared the device of all content. I still had connection errors.

I tried combinations of re-installing the operating system and re-booting and clearing the device. I still had connection errors.

I called my carrier, T-Mobile in the US, and found that they were not experiencing connection difficulties in my area (Chicago).

I called Nokia technical support. Ran through the basics (pull SIM, reboot, etc.) and still had the same problem. They referenced me to this page.

I re-flashed the device and flashed EMMC. This went exactly as the instructions said it would go. I still have problems with connection errors.

I am at the point of having to send the phone to Nokia for technical assistance. Before I do, is there anyone who has had this problem who has found another solution? Is this being caused by any residual code that was "leftover" from the power saving app in the developmental repository?

I have checked other threads on Network Errors, Connection Errors, Network Busy Errors but they seem to all encompass what I have already done.

Any help would be great. Further details: My phone shows full bars of 3G coverage, my wifi is connected, these errors also relate to text messages (unable to send/receive although the N900 shows the texts as sent). Unable to receive calls.

Sorry this is long-winded but I wanted to spell out the steps that I have taken.