online transaction verification via telephone

We are considering providing an online transaction verification service via telephone. Any feedback would be appreciated whether a call to a fixed phone line would be sufficient, or if we should include mobile phones as well for flexibility.

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Great to see that people are getting aware about “Online transaction verification via telephone”. I have come across with one such security service provider who also offers similar security service provider. I would suggest you to please visit their website telesign.com and learn about their powerful tools such as Telephone Verification, Two-Factor Authentication, and PhoneID.

a very good idea mate, hopefully yes achieved