I made this list for HowardForums a while back. It's a complete list of all of the commands in the Samsung SCH-A670 service menu. To enter the menu, type 47*68#13580. You can reset your phone to factory default settings with ease, so be careful, and don't blame me if something goes horribly wrong. Send me an email if you have any questions.

Service #29 (Build EEPROM) will erase all of your stored data and effectively deactivate your phone. To recover after clearing a phone in this manner, use service #73 (Clear All), and when that's done, use service #02 (Restart). Then dial your over-the-air programming call number (*228 for Verizon Wireless) to re-program your phone. That, along with service #37 (Clr LifeTime), should clear your phone in its entirety.

As far as I know, there's no way to permanently brick your phone with this menu, but don't take my word for it.

#01 - Suspend
#02 - Restart
#04 - PCS_MODmode
      CDMA_MODmode
#05 - PCS_MODE ***
      CDMA_MOD****
      FM_MODE ****
      GPS_MOD
      NORMAL *****
#07 - Carrier On
#08 - Carrier Off
#09 - Chan____****
#10 - Pwr level__*
#11 - Rx mute
#12 - Rx Unmute
#13 - Tx mute
#14 - Tx unmute
#16 - Max Pwr: **
#17 - SubLCD C:0**
#19 - LNAREG[**]**
            [00] L1 rise
            [01] L1 fall
            [02] IM LVL1
            [03] L2 rise
            [04] L2 fall
            [05] IM LVL2
            [06] OFFSET1
            [07] OFFSET12
#20 - Rssi -***dBm; LNA GAIN ***
#21 - TEST_S:*****
#22 - Send NAM
#23 - Send S/W Ver
#24 - Send ESN
#25 - Backlight ON
#26 - BacklightDIM
#27 - BacklightOFF
#28 - LED COLOR:_*
#29 - Build EEPROM
#30 - Product Info
#31 - MRU2 TABLE; MRU00[-11]: ******
#34 - CDATA
#37 - Clr LifeTime
#38 - DATASVC ON
#39 - DATASVC OFF
#42 - DTMF on____*
#43 - DTMF off
#48 - Vibrator On
#49 - Vibrator Off
#50 - BATT TYPE: *; Batt_IDV:***
#52 - ***'C[0-7]; CDMA Tp__***
#53 - ***'C[0-7]; PCDTemp__***
#54 - Carr.ID: **
#55 - ExtAudio DIS
#56 - LOOP BACK ON
#57 - PA_R0 HIGH
#58 - PA_R0 LOW
#59 - Unmute all
#60 - CAM: SAMSUN0
#61 - LCD: OLDSUB1
#67 - RD Batt Val
#68 - StbyBatt_***
#69 - TalkBatt_***
#70 - WR Batt__***
#71 - CD TXagc_***
#72 - FM TXagc_***
#73 - Clear All
#74 - Send P Info
#75 - RD Rssi__***
#77 - Therm_vl:***
#78 - ***.*dBm[00]; WrRXRA00_***
#79 - Bac Cal Data
#80 - Res Cal Data
#81 - PCM loop On
#82 - PCM loop Off
#83 - ***'C[0-7]; CDMALMT:****
#84 - ***'C[0-7]; PCS_LMT:****
#85 - YMN DT: ****
#86 - YMN MC: _***
#87 - YMN NC: ****
#88 - TRK adj _***
#89 - CdTk adj_***
#92 - **.*dBm; CT0&1[00-33]***
#94 - -**.*dBm[00-08]; LNA [00-08]***
#98 - Snd Model ID
#99 - TEMP[**]_***
          [00] D HAND MIC
          [01] D HAND SPK
          [02] D HEAD MIC
          [03] D HEAD SPK
          [04] D PHFK MIC
          [05] D PHFK SPK
          [06] D FHFK MIC
          [07] D FHFK SPK
          [08] PHFK RING
          [09] PHFK TONE
          [10] FHFK RING
          [11] FHFK TONE
          [12] HANDSET ST
          [13] HEADSET ST
          [14] CMX QSYNTH
          [15] RESERVED
          [16] RESERVED
          [17] RESERVED
          [18] RESERVED
          [19] RESERVED
#100 - SIO To DM
#111 - GPS MODE App
#112 - D_GPSP:*****
#113 - D_PCS :*****
#115 - GPS ANT*****
#116 - GPS_BCNT:***
#117 - GPS_LCA*****
#118 - GPS_LOSS:***
#119 - D_GPS :*****
#120 - D_CDMA:*****
#121 -  LNA1   ON
#122 -  LNA2   ON
#123 -  LNA12 OFF
#124 - LNA [**]***
           [00] L1 rise
           [01] L1 fall
           [02] IM LVL1
           [03] L2 rise
           [04] L2 fall
           [05] IM LVL2
           [06] OFFSET1
           [07] OFFSET12
#129 - Plat.ID:****
#130 - FS ERASE...
#133 - QBOOT? ____*
#134 - PA NV [**]**
             [00] cdma rise
             [01] cdma fall
#135 - Test En:___*
#139 - A