SMS messaging is an affordable mechanism to communicate with customers, however people change their numbers, travel out of their home network and even change service providers while keeping their original mobile numbers. In sitations like this, Number validation is of great value.
Keeping track of this can be challenging to a business, and can lead to lost SMS costs and a reduced return on investment (ROI).
Identifying the need for number validation
SMS campaigns may be created to cater for a specific time period, or to reach a target market in a specific region. It is possible that a customer is off network, or is in a meeting. Knowing beforehand what numbers are available for sending can substantially reduce the costs of an SMS marketing campaign.
Infobip’s Number Context service
Infobip’s Number Context service connects with the relevant mobile numbers home network and can identify whether the subscribers handset is roaming on another network, currently active or has been disabled. It simply validates your subscriber number.

Number validation is able to provide accurate information on what the original network was and what the current network the subscriber is currently with, efficiently resolving number portability issues.
Enterprises, resellers, retailers and other business that need to ensure that campaigns or messages are accurately and immediately delivered can rapidly verify mobile numbers and reduce messaging costs. Additional uses for Number Context are to re-verify and “clean-up” existing databases of mobile numbers that are kept by companies.
Key features and benefits
- Improve revenue margins and expand service coverage
- Save costs and improve messaging accuracy
- Avoid MNP issues and interworking fees by optimising message routing
- Optimise charging and billing
- Tailored Number Context packages to fit specific market needs and trends
- 24/7/365 technical support
- Guaranteed Quality of Service (QoS) and service availability
- Can be used alongside other Infobip services
IMSI - International Mobile Subscriber Identity is a unique number burned in SIM card. IMSI is used for authentication, to identify a subscriber to the operator.
MSISDN - The actual phone number used for dialing. It is not stored in the SIM card but at the mobile network operator side. This concept allows changing the phone number without changing the SIM card (which contains only IMSI).