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Is it safe to use virtual mobile numbers for account verification & authentication for services such as PayPal, Twitter, Gmail, Linkekdin, etc.? And what is the security drawback for this?

2 Answers 2

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The question is whether its a one time use and forget, or is it kept in their database and used for future verification

If you are certainly sure that it is a one time usage, I don't think there is any problem using a virtual number.

If not, you might end up losing control of the account if you are required for that number (two factor auth for example) or in a very rare case someone else who currently has that virtual number can gain control over your account (more science fiction than reality)

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  • Even if kept in the database, once I use it, it can't be used again in case of 2FA correct. Similar case, when using normal mobile number SMS messages can be intercepted, isn't it?
    – adscnet
    Aug 11, 2014 at 6:05
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its getting tough to use the online numbers for verification. Last time I try with one application, but they are using missed call mobile verification ( some thing like Cognalys) and the virtual numbers are not showing any call logs. The last five digits from the missed call number was the OTP... :)

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  • Cognalys are using different method. Anyhow thanks for the info.
    – adscnet
    Nov 2, 2014 at 10:11

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