Mobile Phone Technology

Phone Numbers
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How can we identify the mobile device? By phone number? There are various numbers within the operation of a mobile network that are important to customers and networks.

  • The International Network Operator Number identifies the mobile network operator that your device is connected to. In the UK, the country code is either 234 or 235, and mobile network operators are identified by an additional two-digit number. The most notable examples are:
    • EE is 30 or 33
    • VodafoneThree is 15 or 20
    • O2 is 10
  • The Equipment Number, each piece of equipment connecting to the mobile phone network has a unique International Mobile Equipment Identity (IMEI). This allows networks to identify phones and also to identify and refuse access to stolen or rogue equipment.
  • A Subscriber Identity Module (SIM) card will also have a unique number called the IMSI (International Mobile Subscriber Identity). This 15-digit number includes the country code (234 or 235 in the UK) and the mobile network code (e.g. 15 for Vodafone). The remaining 10 digits identify the subscriber on the network. This is the key to accessing the services provided on the network.
  • The phone number is the number used to access the device. In the UK, these are 11-digit numbers starting with 07. They are often referred to by their international format as +447...

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