Validate phone numbers
With Smsbox you can validate phone numbers.
Prevent fraud and validate phone numbers before you send an SMS campaign.
Number availability check
Verify users
Optimise delivery rates
Are all the phone numbers in your database real, in the right format and available? By checking these numbers you run more effective campaigns: greater reach, better effect, a lower no-response ratio and better cost efficiency.
Discover our APIVerify users
Secure the conversation between your users and your business and verify new and existing customers. Use the One Time Password SMS API to integrate two-factor authentication via SMS into your own application. Or use the Voice OTP API as a backup of the SMS OTP function, with a spoken text-to-speech password when an SMS isn't delivered or the number is a landline.
Discover our API
Voice messages
Our Text to Speech (TTS) module is included in every tool as standard. It converts your text messages into a spoken message and can be delivered to mobile as well as landline and VOIP numbers. Recipients receive your voice message as a phone call and hear your message as soon as they pick up.
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