Tham khảo 1G

  1. ↑ J.F. Kurose, K.W. Ross, Computer Networking: A Top-Down Approach 7th ed, 6.4.1 An Overview of Cellular Network Architecture
  2. ↑ “1G: First Generation wireless technology”. 
  3. ↑ “Mobiltelefonens historie i Norge”. 
  4. ↑ Arkhangelsk Oblast and Perm Krai. Fixed telephony.