While using wavecom q2403a module,we found it can't attach to network for a long time,even power off the modlue.but if change a SIM card ,it can attach to network immediately,and if change to old SIM card,it can also attach to network immediately.
Any one help ？ Thanks.
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So if I read your comment correct - you can overcome your problem with two scenarios:
A) Changing new/old sim card
B) Network provider can kill the last active PDP context (last active session), and you can re-attach PDP context
Have you checked if new firmware update exists for your Q2403a ?
Also check the trouble shooting section of your wavecom user guide, maybe its equal to this version:
http://www.rfsolutions.co.
Notice that after a PDP context attach and your modem has been idle for X minutes (maybe this is a setting somewhere in modem) the PDP context
moves to "idle state". And only when data is ready for transmission it will force PDP context back to active state. Now maybe something in this process goes wrong (wavecom modem problem or PC/driver problem).
If problem persists - try another GPRS modem (e.g a mobile phone with GPRS and modem access point cabability + bluetooth/IR connection to PC).
This definitely looks like something to do with the service provider since it occurs with specific SIMs or a combination of Q2403 and the service provider. To eliminate one of them, you can try with a different modem.
I've used Q2403A for few applications and never faced such issues.
Additionally, you can check the FAQ area / Support area on Wavecom web site to see if there is a known problem/solution.
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by: zzydPosted on 2006-01-09 at 12:24:11ID: 15653456
Since you write that your problem does not solve with power off, it sounds like your SIM card provider has a network problem.
Ask their support why you have problems with getting an attach.