SMS Deliverer
Free trial
SMS Deliverer

Quectel EC25: SMS compatibility and AT notes

A well-documented LTE module for integrators. We did not test it; everything here is vendor documentation, with power design as the main failure risk.

4G LTE moduleLTE Cat4 (regional variants), UMTS, GSMNot tested by us — vendor specs only

Verdict

A well-documented LTE module for integrators. We did not test it; everything here is vendor documentation, with power design as the main failure risk.

Verification status: Not tested by us — vendor specs only

Specification and SMS behaviour

Chipset / moduleQuectel EC25 LTE module, LCC package, 32.0 × 29.0 × 2.4 mm
InterfacesUSB 2.0, UART, PCM, I2C, SDIO, SGMII. No PCIe.
Power supply3.3–4.3 V supply (typical 3.8 V); GSM transmit bursts require low-ESR bulk capacitance close to VBAT
AT command notes3GPP TS 27.007 / 27.005 command set plus Quectel extensions. Vendor documentation covers text and PDU mode SMS.
Concatenated (long) SMSVendor SMS application note describes concatenated sending (up to 7 parts); not tested by us.
Receiving SMS / OTPVendor documents the full receive path (+CMTI / AT+CMGR); not tested by us.
MMSQuectel publishes a separate MMS application note for this family; not evaluated by us.
Date testedNot tested by us — vendor documentation only (as of 2026-11)

Fields we could not verify are written as "Not verified" rather than filled with estimates.

Known failures and troubleshooting

  • The classic EC25 integration failure is power, not AT: undervoltage during GSM bursts resets the module — check VBAT sag under load.
  • The UART is a 1.8 V domain on some variants; a level mismatch damages the interface — follow the vendor level-shift reference.
  • On Windows the Quectel USB driver must be installed before any COM port appears.

Data sources

Sources: vendor-published specifications and application notes only. SMS Deliverer has not tested this module; nothing on this page is a test result, and unconfirmed fields are marked Not verified.

Related pages

Other models

Guides

Questions about this model

Has SMS Deliverer been tested with the Quectel EC25?

No. This page is a vendor-specification summary, not a test result. Fields without documentation are marked Not verified.

What kills most EC25 SMS integrations?

Power design. GSM transmit bursts pull heavy current; if VBAT sags, the module resets mid-send. Use low-ESR bulk capacitance and short supply runs.