Mobile-phone terms can describe a device, a network technology, a subscriber, or a carrier. This glossary separates those meanings and explains what the abbreviations tell you—and what they do not.
Phone categories
These labels describe broad, overlapping categories, not strict classifications for every phone sold today. An International Telecommunication Union (ITU) report published in 2017 notes that device evolution had blurred the formerly distinct lines between them. ITU, Mobile Handset Use in Digital Financial Services
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| Term | General tendency | Typical use |
|---|---|---|
| Basic phone | Limited features and little or no data connectivity, in the report’s description. | Calls and basic functions where advanced apps or data use are not priorities. |
| Feature phone | A middle category with limited functionality; the 2017 report notes that such phones often used proprietary systems. | Calling, messaging, and a narrower set of additional functions than a smartphone. |
| Smartphone | A broader set of capabilities, commonly including data connectivity and app support. The report discusses the category but does not establish a universal checklist. | People who want a wider range of apps and connected services. |
These are general tendencies based on the ITU’s 2017 report, not guarantees about a particular model or a current market survey. Capabilities vary by device and market.
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Mobile generations and network terms
The generation number is a broad label for a phase of mobile technology. An abbreviation’s expansion is a useful starting point, not a complete technical specification or a promise of a particular connection speed.
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- 2G (Second Generation Mobile): A second-generation label for mobile communications.
- 3G (Third Generation Mobile): A third-generation label for mobile communications.
- 4G (Fourth Generation Mobile): A fourth-generation label for mobile communications.
- LTE (Long Term Evolution): A mobile-network technology name associated with 4G service. The expansion alone does not tell you the speed or quality you will receive.
- GPRS (General Packet Radio Service): A packet-data service associated with GSM networks.
- GSM (Global System for Mobile Communications): A mobile communications system name.
- HSPA (High Speed Packet Access): A family of mobile data technologies associated with 3G networks.
- 3GPP (Third Generation Partnership Project): The partnership that develops technical specifications for mobile telecommunications.
These expansions are drawn from the abbreviation list in the ITU’s 2017 handset report. Actual service depends on the carrier’s network, the device, location, and service conditions; the cited abbreviation list does not quantify performance. ITU, Mobile Handset Use in Digital Financial Services
Subscriber, device, and account identifiers
A subscriber identity and a device identity are different things. In particular, a SIM and an IMEI are not interchangeable.
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- SIM (Subscriber Identity Module) card: A card used by some wireless devices to communicate with a network using a unique code. A removable SIM may be moved to another compatible device; phone designs and SIM arrangements vary. CTIA, Today’s Mobile: Cybersecurity—Protected, Secured and Unified
- IMEI (International Mobile Equipment Identity): A number assigned to a mobile device by its manufacturer and used within a wireless network to identify and confirm that device. It identifies the equipment, not the subscriber. An IMEI by itself does not establish whether a device is eligible for service. CTIA, Today’s Mobile: Cybersecurity—Protected, Secured and Unified
- IMSI (International Mobile Subscriber Identity): An identifier associated with a mobile subscriber. It is distinct from the IMEI, which identifies equipment. The expansion appears in the ITU-T handset report’s abbreviation list. ITU, Mobile Handset Use in Digital Financial Services
- EIR (Equipment Identity Register): A network element that performs checks involving the status of IMEIs. The ITU-T technical supplement lists this term in its mobile-device definitions. ITU-T Q Supplement 76 (10/2023)
Connectivity and messaging
- NFC (Near Field Communication): Short-range wireless communication technology. The ITU report supplies the expansion; that abbreviation alone does not specify how a particular device or service uses it.
- SMS (Short Message Service): The standard term behind text messaging via mobile networks.
- USSD (Unstructured Supplementary Service Data): A protocol used for short exchanges between a phone and a mobile network, often initiated with a code.
- WAP (Wireless Application Protocol): A protocol name associated with mobile access to internet services. It appears in the ITU report’s abbreviation list and should not be taken as a description of all current mobile web access.
- RAN (Radio Access Network): The part of a mobile network that provides the radio connection between devices and the wider network. CTIA includes this consumer-facing term in its glossary. CTIA, Today’s Mobile: Cybersecurity—Protected, Secured and Unified
The expansions for NFC, SMS, USSD, and WAP are listed in the ITU handset report. ITU, Mobile Handset Use in Digital Financial Services
Carrier and network-provider terms
- MNO (Mobile Network Operator): A company that operates a mobile network and sells wireless service. CTIA’s glossary defines the term in a U.S. context, including reference to Federal Communications Commission licensing. Rules and licensing arrangements differ by country. CTIA, Today’s Mobile: Cybersecurity—Protected, Secured and Unified
- MVNO (Mobile Virtual Network Operator): A company that offers subscriptions under its own brand while buying network capacity from an operator. CTIA describes this model in its U.S.-framed glossary; commercial arrangements can vary. CTIA, Today’s Mobile: Cybersecurity—Protected, Secured and Unified
Where to look for formal terminology
For official vocabulary covering International Mobile Telecommunications, ITU-R Recommendation M.1224-1 is listed as in force on the ITU page, with approval dated March 15, 2012. Its status is time-sensitive, so consult the official page for the current listing rather than treating the approval date as a status update. ITU-R Recommendation M.1224-1
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