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Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

dtmf.io

11–20 of 28 posts

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#11
How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse.

And to follow up with that, do the carriers know what you're doing? The reasoning behind SIM cards is it is a hardware security device not unlike a payment card such as a physical debit card that ensures someone has to have the actual device to access the network. This service seems to disagree with that notion.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#12
The product looks nice.

Any one have any idea how to get numbers of any kind (VoIP is fine) that can send and receive SMS from a country like Slovenia? Big providers like Twilio don’t provide it. Twilio only provides sending. Thanks for any help.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#13

How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse. And to follow up with that, do the carriers know what you're doing? The reasoning behind SIM cards is it is a hardware security device not unlike a payment card such as a physical debit card that ensures someone has to have the actual device to access the network. This service seems to disagree with that notion.

> How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse.

Exactly. In addition, in some countries (e.g. Germany) your client is required to have a physical address [1] not only in the country, but also in the area where they get their number.

[1] "Address" being a place where they can receive snail mail AFAIK

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#15
post #13

How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse. And to follow up with that, do the carriers know what you're doing? The reasoning behind SIM cards is it is a hardware security device not unlike a payment card such as a physical debit card that ensures someone has to have the actual device to access the network. This service seems to disagree with that notion.

> How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse. Exactly. In addition, in some countries (e.g. Germany) your client is required to have a physical address [1] not only in the country, but also in the area where they get their number. [1] "Address" being a place where they can receive snail mail AFAIK

We comply with these regulations. To get a German landline number via our service, you must provide proof of an address in the same locality, as well as proof of ID. We supply this to the regulator, and once they approve it, we provide the number.

Many countries do not have these requirements, and for these countries you can just "click and buy".

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#16

How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse. And to follow up with that, do the carriers know what you're doing? The reasoning behind SIM cards is it is a hardware security device not unlike a payment card such as a physical debit card that ensures someone has to have the actual device to access the network. This service seems to disagree with that notion.

In the UK, a SIM card can be purchased without registration. We simply allow you to do that online and give you remote access to your phone (modem). One SIM card and one modem is used by one customer. It isn't really any different to walking into a shop and buying a phone and a SIM card.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#17

Do you have any concrete plans to expand the SIM mobile number service beyond the UK?

It requires infrastructure, so it's not trivial, but we're investigating some options. Obviously it would only be practical in other countries that don't require SIM registration, or if they do, it needs to be possible to do it via some kind of API or other reasonably automated means so that we can build a system to let people register their SIMs.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#18
post #8

Earlier quoted context omitted.

Wouldn't number verification systems (for example, Facebook) eventually start blacklisting your numbers? I have seen this happen with VOIP numbers. Do you have a plan to tackle this?

The physical SIM numbers are SIMs from major UK providers, and are never re-used (for clarity: if you buy a SIM number, you get a SIM that has never been used by anyone else, and it will never be used by anyone else after you). From the perspective of a number verification system (or anything else sending an SMS to them), they are completely indistinguishable from a mobile phone and prepaid SIM, since that is what th…

> it will never be used by anyone else after you

This isn't true; UK mobile numbers are re-used after a period of inactivity by the operator themselves.

Unless, of course, you're keeping the number/line live in permanence? But I can't see how your service would make that work financially.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#19
post #8

Earlier quoted context omitted.

The physical SIM numbers are SIMs from major UK providers, and are never re-used (for clarity: if you buy a SIM number, you get a SIM that has never been used by anyone else, and it will never be used by anyone else after you). From the perspective of a number verification system (or anything else sending an SMS to them), they are completely indistinguishable from a mobile phone and prepaid SIM, since that is what th…

> it will never be used by anyone else after you This isn't true; UK mobile numbers are re-used after a period of inactivity by the operator themselves. Unless, of course, you're keeping the number/line live in permanence? But I can't see how your service would make that work financially.

If you re-read what I wrote, or perhaps quote the whole thing, you'll see that I was referring to the SIM, not to the phone number.

Of course unless phone numbers perpetually get longer, they have to eventually get re-used. We don't implement any re-use but the operator will indeed eventually recycle them.

Re: Show HN: Dtmf.io – virtual phone numbers from 50 countries, and SIMs in the UK

#20
post #15
post #13

Earlier quoted context omitted.

> How do you plan to prevent abuse and fraud? This seems like it could attract a great amount of misuse. Exactly. In addition, in some countries (e.g. Germany) your client is required to have a physical address [1] not only in the country, but also in the area where they get their number. [1] "Address" being a place where they can receive snail mail AFAIK

We comply with these regulations. To get a German landline number via our service, you must provide proof of an address in the same locality, as well as proof of ID. We supply this to the regulator, and once they approve it, we provide the number. Many countries do not have these requirements, and for these countries you can just "click and buy".

Out of curiosity how do you verify these things?
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