# Quectel EC25 & EC21

> For the complete documentation index, see [llms.txt](https://help.1nce.com/llms.txt).

EC25 & EC21 AT command interface defaults to the GSM character set. EC25 & EC21 modules support  
the following character sets:

- GSM format
- UCS2
- IRA

# EC25 RAT Configuration

Setup and configure the Quectel EC25 or EC21 for use with 1NCE SIM.

- 📲 [EC25 RAT Configuration](/docs/blueprints-examples/ec25-rat-configuration)

# Network Registration:

Network registration is the process by which a cellular device connects to a cellular network and obtains the necessary credentials to access the network's services. This process involves several steps, including network selection, authentication, and registration.

- 📲 [EC25 Network Registration](/docs/blueprints-examples/ec25-network-registration)

# ICMP Ping

Connect with the EC25 or EC21 to a mobile network, start a data session, and issue an ICMP Ping request. 

- 📲 [EC25 ICMP Ping](/docs/blueprints-examples/ec25-icmp-ping)

# MO-SMS

Send an SMS message from an EC25 or EC21 to the 1NCE SMS Forwarding Service.

- 📲 [EC25 MO-SMS](/docs/blueprints-examples/ec25-mo-sms)

# MT-SMS

Receive SMS messages with a Quectel EC25 or EC21.

- 📲 [EC25 MT-SMS](/docs/blueprints-examples/ec25-mt-sms)

# TCP Client

Connect to a TCP Server and send/receive data using a Quectel EC25 or EC21.

- 📲 [EC25 TCP Client Connection](/docs/blueprints-examples/ec25-tcp-client-connection)

# 1NCE OS UDP Protocol

- 🦉 [EC25 & EC21 1NCE OS UDP](/docs/blueprints-examples/ec25-ec21-1nce-os-udp)