IMSI Query

The IMSI Query (number lookup) service identifies the 15-digit IMSI number of the mobile subscriber's phone number (MSISDN). The IMSI (International Mobile Subscriber Identity) is a unique number which designates the mobile subscribers in GSM and UMTS networks. This is also known as an IMSI Lookup.

By employing this service, Wireless Application Service Providers, MVNOs, MVNEs, SMS aggregators and resellers, mobile infrastructure providers, mobile operators and Push-to-Talk service providers are optimizing their SMS routing and / or enabling Push-to-Talk (PTT) service.

Contact txtNation Request more information on our IMSI Query solution »

International IMSI Query Identification

With today's high churn rates of subscribers, mobile service providers have to deal with an increasing number of invalid or non-active phone numbers. The HLR Active Subscriber Query helps the mobile industry to identify invalid or unused numbers thus reducing ongoing cost of SMS sending to such numbers. By identifying invalid numbers, customers save on SMS sending to unused or non-active numbers.

Real Optimisation of SMS Routing

IMSI Query enables the IMSI identification, providing a true international mobile number identification service. Additionally, txtNation provides customers with technical support and customer care, which are available 24/7/365.

IMSI information for Mobile Security

IMSI Query provides subscriber information for authentication and authorization of the user in mobile security applications and scenarios.

Services enabled by IMSI Query
• The IMSI number identification is used for international handling of SMS messages sent via SS7 signaling
• The IMSI number identification is used for Push-To-Talk services
• IMSI Lookup provides information for routing and optimization of telecommunications infrastructure


Contact txtNation Contact us for pricing.

Request more information on our IMSI Query solution