After a lot of experimenting with the SMS subject, I noticed all by chance, that when my provider sent an SMS for advertisment purposes, the program could not handle it properly because in Hserin line to get the SMS, a 10 digit number was expected and not the 4 digit one.

Keep in mind that the "defaults" may not always be default enough!

Here is my test subroutine:
Code:
read_sms:
	Lcdout com,line1,"Reading SMS"
	HSerout ["AT+CMGL=",34,"ALL",34,13]  '"ALL" is for Wavecom module. Read all SMS 
	' Read Caller ID etc. The timeout value in the HSERIN statement is important.
	' it takes some time before the phone replies to the AT+CMGL command
	HSerin 5000,ex_sms4,[wait("READ"),wait("+30"),str cc_phone\10,wait(44,44,34),SKIP 23,STR array\15\13] 'Number is waitstr command\10
	LCDOut com,1,"Read 1 SMS"
	pause 1000
sms_delete:
	LCDOut com,1,"Deleting SMS"
	HSerout ["AT+CMGD=1,4",13]			'Delete all messages
	HSerin 19000,ex_sms2,[wait("OK")]     'Wait for OK (null)
	LCDOut com,line1,"Deleted SMS "
	Pause 1000
	return
ex_sms2:    'No new message or timeout error
	LCDOut com,line2,"Error",rep " "\11:Pause 1000
	return
ex_sms4:    'Wrong Number!
	LCDOut com,line2,"Error phone Nbr":Pause 1000
	goto sms_delete
At the 3rd command line where HSerin 5000,ex_sms4,[wait... is executed, the command waits for +30 which is the country code for Greece, then I get 10 digits for the phone that is sending the SMS.

But if the sender has only 4 digits I now through the timeout, jump to ex_sms4 and after an LCD message, the new and irrelevant SMS is deleted.


Hope this helps all that deal with SMS stuff.

Ioannis