Just been at a customer trying to fix a problem with a really old wavecom modem that seem to malfunction after detaching from the gsm layer. This worked fine:
detach gprs
attach gprs
start pppd
… and this failed in a script:
detach gprs
detach gsm
attach gsm
attach gprs
start pppd
But worked when executing the commands (bash functions that wrapped the various chat scripts) one by one …. strange. Not really. Timing problems, as usual!
OK, so we added a small sleep (1 second I think) after attaching to gprs. Et voila. it worked again.
…. modems modems modems. Can’t live with or without them 
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