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== Network Service Commands ==
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=75 '''6.1. AT+COPS Operator Selection - page 74''']
The command returns the current operators and their status, and allows setting automatic or manual network selection.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=77 '''6.2. AT+CREG Network Registration - page 76''']
The Read Commandreturns the network registration status. The write command sets whether or not to present URC.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=79 '''6.3. AT+CSQ Signal Quality Report - page 78''']
The command indicates the received signal strength <rssi> and the channel bit error rate <ber>.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=80 '''6.4. AT+CPOL Preferred Operator List - page 79''']
The commande dits and queries the list of preferred operators.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=82 '''6.5. AT+COPN Read Operator Names - page 81''']
The command returns the list of operator names from the ME. Each operator code <numericn>that has an alphanumeric equivalent <alphan>in the ME memory is returned.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=82 '''6.6. AT+CTZU Automatic Time Zone Update - page 81''']
The Write Command enables and disables automatic time zone update via NITZ. The configuration is stored to NV automatically.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=83 '''6.7. AT+CTZR Time Zone Reporting - page 82''']
This command controls the time zone reporting of changed event. If reporting is enabled,the MT returns the unsolicited result code +CTZV: <tz>or+CTZE: <tz>,<dst>,<time>whenever the time zone is changed. The configuration is stored to NV automatically.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=85 '''6.8. AT+QLTS Obtain the Latest Time SynchronizedThrough Network - page 84''']
The command is used to obtain the latest time synchronized through network.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=86 '''6.9. AT+QNWINFOQuery Network Information - page 85''']
The command indicates network information such as access technology selected, the operator and the band selected.
[https://wiki.teltonika-networks.com/wikibase/images/2/2e/Quectel_EC25EC21_AT_Commands_Manual_V1.2.pdf#page=88 '''6.10. AT+QSPNDisplay the Name of Registered Network - page 87''']