Thread: N900 Problem: SIM Card Not Recognized
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maddler is offline maddler
2010-05-09 , 23:42
Posts: 68 | Thanked: 16 times | Joined on Feb 2007
#96
Just did some testing to try to better understand what's wrong with some sim cards.

What I found is that, most likely, is not with the card itself but with cell towers or at least something not directly related to my N900.

I'm running attached script (which basically tries to read IMSI from inserted SIM), this way I can detect whenever a SIM reading error happens.

I did my test on:

1) H3G ITA, 3G connection, home network
2) TIM IT, 2.5G connection, roaming network

As far as I was able to see errors are more frequent while on my home network than when the on TIM. Here is a sample result:
Code:
101010012032 - ALERT! SIM ERROR! After 2398 seconds. Battery chrg status false <-- I was on TIM before
101010012042 - ALERT! SIM ERROR! After 11 seconds. Battery chrg status false
101010012123 - ALERT! SIM ERROR! After 40 seconds. Battery chrg status false
101010012134 - ALERT! SIM ERROR! After 11 seconds. Battery chrg status false
101010012144 - ALERT! SIM ERROR! After 10 seconds. Battery chrg status false
101010012202 - ALERT! SIM ERROR! After 18 seconds. Battery chrg status false
101010012203 - ALERT! SIM ERROR! After 1 seconds. Battery chrg status false
101010012204 - ALERT! SIM ERROR! After 1 seconds. Battery chrg status false
101010012205 - ALERT! SIM ERROR! After 1 seconds. Battery chrg status false
101010012206 - ALERT! SIM ERROR! After 1 seconds. Battery chrg status false
101010012208 - ALERT! SIM ERROR! After 2 seconds. Battery chrg status false
101010012312 - ALERT! SIM ERROR! After 64 seconds. Battery chrg status false
101010012338 - ALERT! SIM ERROR! After 26 seconds. Battery chrg status false
101010012404 - ALERT! SIM ERROR! After 26 seconds. Battery chrg status false
101010012452 - ALERT! SIM ERROR! After 48 seconds. Battery chrg status false
101010012503 - ALERT! SIM ERROR! After 11 seconds. Battery chrg status false
101010012518 - ALERT! SIM ERROR! After 15 seconds. Battery chrg status false
101010012529 - ALERT! SIM ERROR! After 11 seconds. Battery chrg status false
101010012555 - ALERT! SIM ERROR! After 26 seconds. Battery chrg status false
101010012602 - ALERT! SIM ERROR! After 7 seconds. Battery chrg status false
101010012641 - ALERT! SIM ERROR! After 39 seconds. Battery chrg status false
101010012712 - ALERT! SIM ERROR! After 31 seconds. Battery chrg status false
I have the feeling that the issue is related to two specific towers close to my house. I'll be running same tests tomorrow on another location and I'll compare them.
Attached Files
File Type: txt checksim.txt (1.3 KB, 270 views)