# GSM network problem

**URL:** <https://forum.sierrawireless.com/t/gsm-network-problem/4906>\
**Category:** Open AT\
**Created:** [February 21, 2011, 9:07am UTC](https://forum.sierrawireless.com/t/gsm-network-problem/4906 "2011-02-21T09:07:37Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\
**Post date:** [February 21, 2011, 11:43am UTC](https://forum.sierrawireless.com/t/gsm-network-problem/4906/4 "2011-02-21T11:43:04Z")

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> [@zafer](#):
>
> Do you think that modem gets stuck in “Emergency Calls Only” mode?

Not if you are correct that AT+CREG? returns “1” for “stat” - ie, the unit is registered on its Home network.

Can you speak to technical staff at the network operator about this?

Or your Distributor or FAE - it might be a known “feature” of your local network(s)…

> [@](#):
>
> And AT+COPS=0 will reset the PLMN search and will allow the module to escape from stuck?

As noted in the link I gave, it does seem that AT+COPS=0 does more than is documented, and does allow an escape from some “anomolous” registration conditions.

I haven’t seen the condition you describe, so I don’t know whether AT+COPS=0 will help in your particular case or not - you will have to try it yourself to see what happens!

> [@](#):
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> I will try to apply AT+COPS=0 in my application.

Great - please post the results!

> [@](#):
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> Should i set a timer which executes AT+COPS=0 in every 24 hours?

Again, this behaviour of AT+COPS=0 is undocumented - so who knows whether there might be any problems in doing this…?

> [@](#):
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> Or is there a better method to discover stuck state and escaping from it?

If AT+CREG? is, effectively, lying to you, then I don’t think that there’s a lot you can do!

Unless there is some other feature of your application that you can use; eg, \* is GPRS affected?

- Do AT+CSQ or AT+CCED or any others give any useful hints?
- Can the unit send and/or receive SMS in this state?
- Does your application expect some regular incoming contact, and can it use that as the basis for a timeout to deduce that it has lost comms…?

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