info(at) +49 (0)89 90 410 20 - 0

Cellular M2M

The unidirectional EFR longwave broadcast system is complemented by a cellular reverse channel. The cellular expertise of Telefónica, combined with the industry know-how of EFR, enables optimized communications solutions for the energy industry. 

The EFR Utility SIM offers economical, industry-specific tariffs. All German cellular networks, as well as neighboring foreign networks, can be used at no additional cost. This ensures optimal network coverage and reduces installation time by eliminating the need to check the availability of different networks. 

With its unique private APN access points, the EFR Utility SIM enables data transfer via a closed network. This enables, for example, secure and fast-responding IP-based communications with renewable energy facility controllers.  Industry-specific support makes the EFR solution better than the M2M offerings of cellular providers. For questions about using the SIM card or about the EFR system, the EFR team offers advice to energy providers and grid operators, whether small or large, on specific issues related to system setup and use. 


The EFR Utility SIM is specifically designed to meet the requirements of the energy industry. In terms of contract details and features, it is optimally matched to typical applications in the industry.

Maximum network coverage

  • Use all cellular networks in Germany (all-network SIM)  
  • Including foreign networks in border areas 
  • All generations with just one SIM: 2G, 3G, 4G and 5G 
  • Powered by Telefónica 

Cellular services

  • Data communications, including data pooling 
  • Sending and receiving text messages (SMS) 
  • IP data communications, e.g. for head-end systems and/or ZFA 

Secure infrastructure

  • Own grid groups (APN) 
  • Fixed or dynamic IP addresses 
  • Site-to-site encryption 

SIM card management

  • Supports embedded SIM     
  • Cost management through traffic limits and data pooling 
  • Reporting and monitoring 
  • Manipulation protection to combat SIM theft 

Your contact

Bernhard Sbick

Head of Longwave System Technology

+49 (0)30 398 75 – 494


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