The GSM modem will respond in 2 ways, “ERROR” will be returned if the AT command is not supported.If the command is executed successfully an OK will be returned after the response text.e.g.

AT+CBC=?
response text will be as follows;
+CBC :(0,2),(0-100)
OK

List of AT Commands
————————–

1. AT Attention command
2. AT* List all supported AT commands
3. ATZ Restore to user profile (ver. 2)
4. AT&F Set to factory-defined configuration (ver. 2)
5. ATI Identification information (ver. 3)
6. AT&W Store user profile
7. AT+CLAC List all available AT commands
8. AT+CGMI Request manufacturer identification (ver. 1)
9. AT+CGMM Request model identification
10. AT+CGMR Request revision identification
11. AT+CGSN Request product serial number identification
12. AT+GCAP Request modem capabilities list
13. AT+GMI Request manufacturer information
14. AT+GMM Request model identification
15. AT+GMR Request revision identification
16. ATA Answer incoming call command (ver. 2)
17. ATH Hook control (ver. 2)
18. ATD Dial command (ver. 5)
19. ATO Return to online data mode
20. AT+CVHU Voice hangup control
21. AT+CLCC List current calls
22. AT*CPI Call progress information
23. ATE Command echo (ver. 2)
24. ATSO Automatic answer control
25. ATS2 Escape sequence character
26. ATS3 Command line termination character (ver. 3)
27. ATS4 Response formatting character (ver. 3)
28. ATS5 Command line editing character (ver. 3)
29. ATS7 Completion connection timeout
30. ATS10 Automatic disconnect delay control
31. ATQ Result code suppression (ver. 2)
32. ATV DCE response mode (ver. 2)
33. ATX Call progress monitoring control
34. AT&C Circuit 109 (DCD) control
35. AT&D Circuit 108 (DTR) response
36. AT+IFC Cable interface DTE-DCE local flow control
37. AT+ICF Cable interface character format (ver. 2)
38. AT+IPR Cable interface port rate
39. AT+ILRR Cable interface local rate reporting
40. AT+DS Data compression (ver. 3)
41. AT+DR Data compression reporting
42. AT+WS46 Mode selection
43. AT+FCLASS Select mode
44. AT*ECBP CHF button pushed (ver. 2)
45. AT+CMUX Switch to 07.10 multiplexer (ver. 2)
46. AT*EINA Ericsson system interface active
47. AT*SEAM Add menu item
48. AT*SESAF SEMC show and focus
49. AT*SELERT SEMC create alert (information text)
50. AT*SESTRI SEMC create string Input
51. AT*SELIST SEMC create list
52. AT*SETICK SEMC create ticker
53. AT*SEDATE SEMC create date field
54. AT*SEGAUGE SEMC create gauge (bar graph/progress feedback)
55. AT*SEGUP SEMC update gauge (bar graph/ progress feedback)
56. AT*SEONO SEMC create on/off input
57. AT*SEYNQ SEMC create yes/no question
58. AT*SEDEL SEMC GUI delete
59. AT*SESLE SEMC soft key label (ver. 1)
60. AT*SERSK SEMC remove soft key
61. AT*SEUIS SEMC UI session establish/terminate
62. AT*EIBA Ericsson Internal Bluetooth address
63. AT+BINP Bluetooth input
64. AT+BLDN Bluetooth last dialled number
65. AT+BVRA Bluetooth voice recognition activation
66. AT+NREC Noise reduction and echo cancelling
67. AT+VGM Gain of microphone
68. AT+VGS Gain of speaker
69. AT+BRSF Bluetooth retrieve supported
70. AT+GCLIP Graphical caller ID presentation
71. AT+CSCS Select TE character set (ver. 3)
72. AT+CHUP Hang up call
73. AT+CRC Cellular result codes (ver. 2)
74. AT+CR Service reporting control
75. AT+CV120 V.120 rate adaption protocol
76. AT+VTS DTMF and tone generation
77. AT+CBST Select bearer service type (ver. 3)
78. AT+CRLP Radio link protocol (ver. 2)
79. AT+CEER Extended error report (ver. 2)
80. AT+CHSD HSCSD device parameters (ver. 2)
81. AT+CHSN HSCSD non-transparent call configuration (ver. 2)
82. AT+CHSC HSCSD current call parameters (ver. 2)
83. AT+CHSR HSCSD parameters report (ver. 2)
84. AT+CHSU HSCSD automatic user-initiated upgrade
85. AT+CNUM Subscriber number (ver. 2)
86. AT+CREG Network registration (ver. 2)
87. AT+COPS Operator selection (ver. 2)
88. AT+CLIP Calling line identification (ver. 2)
89. AT+CLIR Calling line identification restriction
90. AT+CCFC Calling forwarding number and conditions (ver. 2)
91. AT+CCWA Call waiting (ver. 2)
92. AT+CHLD Call hold and multiparty (ver. 1)
93. AT+CSSN Supplementary service notification (ver. 2)
94. AT+CAOC Advice of charge
95. AT+CACM Accumulated call meter (ver. 2)
96. AT+CAMM Accumulated call meter maximum
97. AT+CDIP Called line identification presentation
98. AT+COLP Connected line identification presentation
99. AT+CPOL Preferred operator list
100. AT+COPN Read operator names
101. AT*EDIF Divert function (ver. 2)
102. AT*EIPS Identify presentation set
103. AT+CUSD Unstructured supplementary service data (ver. 2)
104. AT+CLCK Facility lock (ver. 5)
105. AT+CPWD Change password (Ver. 3)
106. AT+CFUN Set phone functionality (ver. 2)
107. AT+CPAS Phone activity status (ver. 3)
108. AT+CPIN PIN control (ver. 2)
109. AT+CBC Battery charge (ver. 2)
110. AT+CSQ Signal quality (ver.1)
111. AT+CKPD Keypad control (ver. 7)
112. AT+CIND Indicator control (ver. 5)
113. AT+CMAR Master reset
114. AT+CMER Mobile equipment event reporting
115. AT*ECAM Ericsson call monitoring (ver. 2)
116. AT+CLAN Language
117. AT*EJAVA Ericsson Java application function
118. AT+CSIL Silence Command
119. AT*ESKL Key-lock mode
120. AT*ESKS Key sound
121. AT*EAPP Application function (ver. 5)
122. AT+CMEC Mobile equipment control mode
123. AT+CRSM Restricted SIM access
124. AT*EKSE Ericsson keystroke send
125. AT+CRSL Ringer sound level (ver. 2)
126. AT+CLVL Loudspeaker volume level
127. AT+CMUT Mute control
128. AT*EMEM Ericsson memory management
129. AT+CRMP Ring melody playback (ver. 2)
130. AT*EKEY Keypad/joystick control (ver. 2)
131. AT*ECDF Ericsson change dedicated file
132. AT*STKC SIM application toolkit configuration
133. AT*STKE SIM application toolkit envelope command send
134. AT*STKR SIM application toolkit command response
135. AT+CMEE Report mobile equipment error
136. AT+CSMS Select message service (ver.2)
137. AT+CPMS Preferred message storage (ver. 4)
138. AT+CMGF Message format (ver. 1)
139. AT+CSCA Service centre address (ver. 2)
140. AT+CSAS Save settings
141. AT+CRES Restore settings
142. AT+CNMI New messages indication to TE (ver. 4)
143. AT+CMGL List message (ver. 2)
144. AT+CMGR Read message (ver. 2)
145. AT+CMGS Send message (ver. 2)
146. AT+CMSS Send from storage (ver. 2)
147. AT+CMGW Write message to memory (ver. 2)
148. AT+CMGD Delete message
149. AT+CMGC Send command (ver. 1)
150. AT+CMMS More messages to send
151. AT+CGDCONT Define PDP context (ver. 1)
152. AT+CGSMS Select service for MO SMS messages
153. AT+CGATT Packet service attach or detach
154. AT+CGACT PDP context activate or deactivate
155. AT+CGDATA Enter data state
156. AT+CGEREP Packet domain event reporting (ver. 1)
157. AT+CGREG Packet domain network registration status
158. AT+CGPADDR Show PDP address
159. AT+CGDSCONT Define secondary PDP context
160. AT+CGTFT Traffic flow template
161. AT+CGEQREQ 3G quality of service profile (requested)
162. AT+CGEQMIN 3G quality of service profile (minimum acceptable)
163. AT+CGEQNEG 3G quality of service profile (negotiated)
164. AT+CGCMOD PDP context modify
165. Extension of ATD – Request GPRS service
166. Extension of ATD – Request packet domain IP service
167. AT+CPBS Phonebook storage (ver. 3)
168. AT+CPBR Phonebook read (ver. 2)
169. AT+CPBF Phonebook find (ver. 2)
170. AT+CPBW Phonebook write (ver. 4)
171. AT+CCLK Clock (ver. 4)
172. AT+CALA Alarm (ver. 3)
173. AT+CALD Alarm delete
174. AT+CAPD Postpone or dismiss an alarm (ver. 2)
175. AT*EDST Ericsson daylight saving time
176. AT+CIMI Request international mobile subscriber identity
177. AT*EPEE PIN event
178. AT*EAPS Active profile set
179. AT*EAPN Active profile rename
180. AT*EBCA Battery and charging algorithm (ver. 4)
181. AT*ELIB Ericsson list Bluetooth devices
182. AT*EVAA Voice answer active (ver. 1)
183. AT*EMWS Magic word set
184. AT+CPROT Enter protocol mode
185. AT*EWDT WAP download timeout
186. AT*EWBA WAP bookmark add (ver. 2)
187. AT*EWCT WAP connection timeout
188. AT*EIAC Internet account, create
189. AT*EIAD Internet account configuration, delete
190. AT*EIAW Internet account configuration, write general parameters
191. AT*EIAR Internet account configuration, read general parameters
192. AT*EIAPSW Internet account configuration, write PS bearer parameters
193. AT*EIAPSR Internet account configuration, read PS bearer parameters
194. AT*EIAPSSW Internet account configuration, write secondary PDP context parameters
195. AT*EIAPSSR Internet account configuration, read secondary PDP context parameters
196. AT*EIACSW Internet account configuration, write CSD bearer parameters
197. AT*EIACSR Internet account configuration, read CSD bearer parameters
198. AT*EIABTW Internet account configuration, write Bluetooth bearer parameters
199. AT*EIABTR Internet account configuration, read Bluetooth bearer parameters
200. AT*EIAAUW Internet account configuration, write authentication parameters
201. AT*EIAAUR Internet account configuration, read authentication parameters
202. AT*EIALCPW Internet account configuration, write PPP parameters – LCP
203. AT*EIALCPR Internet account configuration, read PPP parameters – LCP
204. AT*EIAIPCPW Internet account configuration, write PPP parameters – IPCP
205. AT*EIAIPCPR Internet account configuration, read PPP parameters – IPCP
206. AT*EIADNSV6W Internet account configuration, write DNS parameters – IPv6CP
207. AT*EIADNSV6R Internet account configuration, read DNS parameters – IPv6CP
208. AT*EIARUTW Internet account configuration, write routing table parameters
209. AT*EIARUTD Internet account configuration, delete routing table parameters
210. AT*EIARUTR Internet account configuration, read routing table parameters
211. AT*SEACC Accessory class report
212. AT*SEACID Accessory identification
213. AT*SEACID2 Accessory identification (Bluetooth)
214. AT*SEAUDIO Accessory class report
215. AT*SECHA Charging control
216. AT*SELOG SE read log
217. AT*SEPING SE ping command
218. AT*SEAULS SE audio line status
219. AT*SEFUNC SE functionality status (ver. 2)
220. AT*SEFIN SE flash Information
221. AT*SEFEXP Flash auto exposure setting from ME
222. AT*SEMOD Camera mode indicator to the flash
223. AT*SEREDI Red eye reduction indicator to the flash
224. AT*SEFRY Ready indicator to the ME
225. AT*SEAUP Sony Ericsson audio parameters
226. AT*SEVOL Volume level
227. AT*SEVOLIR Volume indication request
228. AT*SEBIC Status bar icon
229. AT*SEANT Antenna identification
230. AT*SESP Speakermode on/off
231. AT*SETBC Text to bitmap converter
232. AT*SEAVRC Sony Ericsson audio video remote control
233. AT*SEMMIR Sony Ericsson multimedia information request
234. AT*SEAPP Sony Ericsson application
235. AT*SEAPPIR Sony Ericsson application indication request
236. AT*SEJCOMM Sony Ericsson Java comm
237. AT*SEDUC Sony Ericsson disable USB charge
238. AT*SEABS Sony Ericsson accessory battery status
239. AT*SEAVRCIR Sony Ericsson audio video remote control indication request
240. AT*SEGPSA Sony Ericsson global positioning system accessory
241. AT*SEAUDIO Accessory class report
242. AT*SEGPSA Sony Ericsson global positioning system accessory
243. AT*SEAUDIO Accessory Class Report
244. AT*SEGPSA Sony Ericsson global positioning system accessory
245. AT*SETIR Sony Ericsson time information request
246. AT*SEMCM Sony Ericsson memory card management
247. AT*SEAUDIO Accessory Class Report