Turn off echo 
=============
    ATE
    |
    | OK

Check if pin code is needed
===========================
    AT+CPIN?
    | 
    | +CPIN: READY
    | 
    | OK

Set pin code if not ready
=========================
    AT+CPIN="1234"
    | ERROR

Disable pin code when ready
===========================
    AT+CLCK="SC",0,"1234"
    |

Register in network
===================
    AT+CREG=1
    | OK

Check SMS capability
====================
    AT+CSMS=0
    | +CSMS: 1,1,1
    | ERROR

Write message to storage
========================
    AT+CMGW="+46702575687"
    > Hej <ctl-z>
    | +CMGW: 1

Send message from storage (1)
=============================
    AT+CMSS=1
    | +CMS ERROR: 331 (network not available)
    | +CMS ERROR: 303 (....)

Service center
==============
    AT+CSCA?
    | +CSCA: "+46705008999",145

Text/Pdu mode
=============
    AT+CMGF=1    text mode
    AT+CMGF=0    pdu mode
 
Receive SMS notification
========================
    AT+CNMI=1,1   - New incoming SMS is displayed like
 
    | +CMTI: "SM",<x>   (x = counter)
 
    AT+CNMI=1,2   - Display incoming messages on arrival (unsolicited)

List SMS
========
    AT+CMGL
    | +CMGL:<x>,"REC UNREAD","+number"
    |    message
 
    AT+CMGL="ALL"

    AT+CMGL=1   (pdu mode)
    | +CMGL: <x>,<y>,<str>,<len>
    |  <PDU>
    |
 
Read SMS
========
    AT+CMGR=<x>

Delete SMS
==========
    AT+CMGD=<x>(,<x>)*
 

Send SMS in PDU mode
====================


    AT+CMGS=23  //Send message, 23 octets (excluding the two initial zeros)
%% >0011000B916407281553F80000AA0AE8329BFD4697D9EC37<ctrl-z>
%%)
%% There are 23 octets in this message (46 'characters'). The first octet ("00")
%% doesn't count, it is only an indicator of the length of the SMSC information
%% supplied (0).
%%
%%

Sigal quality
	
AT+CSQ?
+CSQ:18,99

AT+CSQ

+CSQ: 4,0

OK

Value	RSSI dBm	Condition
2	-109	Marginal
3	-107	Marginal
4	-105	Marginal
5	-103	Marginal
6	-101	Marginal
7	-99	Marginal
8	-97	Marginal
9	-95	Marginal
10	-93	OK
11	-91	OK
12	-89	OK
13	-87	OK
14	-85	OK
15	-83	Good
16	-81	Good
17	-79	Good
18	-77	Good
19	-75	Good
20	-73	Excellent
21	-71	Excellent
22	-69	Excellent
23	-67	Excellent
24	-65	Excellent
25	-63	Excellent
26	-61	Excellent
27	-59	Excellent
28	-57	Excellent
29	-55	Excellent
30	-53	Excellent