Mobile Provider Lookup

What is a GSM provider lookup?

A GSM provider lookup identifies the mobile network operator associated with a phone number or Mobile Country Code/Mobile Network Code (MCC/MNC) pair. Every mobile network worldwide has a unique MCC/MNC identifier — for example, 310/260 is T-Mobile US, 234/10 is O2 UK. This tool decodes these identifiers to show the carrier name and country.

MCC/MNC codes are broadcast by cell towers and stored in SIM cards. They are used in telecommunications for network identification, roaming agreements, SIM card provisioning, and regulatory compliance. Security researchers and telecom engineers use MCC/MNC lookup tools to analyze network configurations and verify carrier information.

How to use this tool

Enter an MCC/MNC code pair to look up the associated mobile network operator and country. You can also browse the complete database by country to find all registered operators. The tool covers GSM, UMTS, LTE, and 5G networks worldwide.

Understanding MCC and MNC

• MCC (Mobile Country Code) — a three-digit code identifying the country. Examples: 310-316 for USA, 234 for UK, 262 for Germany.
• MNC (Mobile Network Code) — a two or three-digit code identifying the specific operator within that country.
• Together, MCC+MNC uniquely identifies any mobile network globally. The IMSI (International Mobile Subscriber Identity) on your SIM starts with these codes.
• The database is maintained by the ITU (International Telecommunication Union) and updated as new operators launch or existing ones merge.

Practical applications

Telecom professionals use MCC/MNC lookup for roaming diagnostics (verifying which network a phone has connected to), fraud detection (identifying suspicious network registrations), regulatory compliance, and network planning. App developers use it to identify user carrier information for analytics. IoT device management often requires MCC/MNC verification for SIM provisioning across international deployments.

Frequently asked questions

Can I determine the carrier from just a phone number?

Not reliably. Due to number portability (the ability to keep your phone number when switching carriers), a phone number's original carrier assignment may no longer be accurate. The MCC/MNC approach identifies the actual network the SIM is registered with, regardless of the phone number. For phone number carrier lookup, specialized HLR (Home Location Register) query services are needed.

What is the difference between GSM, LTE, and 5G in this context?

GSM (2G), UMTS (3G), LTE (4G), and 5G are different generations of mobile network technology. The MCC/MNC system identifies the operator, not the technology. A single operator (like T-Mobile with MCC 310 / MNC 260) runs GSM, LTE, and 5G networks simultaneously under the same MCC/MNC. The code identifies the company, and the phone negotiates which technology to use based on coverage and capability.