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International Dialing & SMS

Some numbers are forbidden at a system level by Tropo and cannot be enabled for any account. Examples are 911 for the US Emergency, 44999 for UK Emergency, high-fraud premium rate number ranges, and some identity-verification services that use phone numbers to establish new accounts.

In order to dial a number, it needs to be in the following format (this example is for the Netherlands with the country code 31):

+31105550100

There is no need to include a local dialing code as you'd use when making an international call from your phone. For example, when using a mobile phone, a US caller needs to dial 011 before a number to dial internationally. A mobile caller in the UK needs to dial 00 before the number. Neither of these are needed, you only need to dial the country code and the number.

The pricing for production calls to any destination in the world are listed on our pricing page.


Worldwide Phone Numbers

Tropo offers numbers in 13 countries:

  • Belgium: Local and Toll Free numbers with voice. Mobile numbers with text messaging. Address verification is required.
  • Denmark: Local and Toll Free numbers with voice. Mobile numbers with text messaging.
  • Finland: Local and Toll Free numbers with voice.
  • France: Local and Toll Free numbers with voice. Address verification is required.
  • Germany: Local and Toll Free numbers with voice. Mobile numbers with text messaging. Address verification is required.
  • Ireland: Local and Toll Free numbers with voice. Mobile numbers with text messaging. Address verification is required.
  • Italy: Local and Toll Free numbers with voice.
  • Netherlands: Local and Toll Free numbers with voice. Address verification is required.
  • Portugal: Local and Toll Free numbers with voice.
  • Spain: Local and Toll Free numbers with voice. Mobile numbers with text messaging.
  • Sweden: Local and Toll Free numbers with voice. Mobile numbers with text messaging.
  • United Kingdom: Local and Toll Free numbers with voice. Mobile numbers with text messaging.
  • United States of America: Local and Toll Free numbers with voice and text messaging.

Access to phone numbers in some countries is limited by local laws.

To get a phone number in Belgium, France, Germany, Ireland, or Netherlands, you or your business must be located in that country. You'll need to contact Tropo Support with a home or office address in that country before we can give you a number.

For Germany you'll also need to provide documentation proving you live in the area that matches the phone number's country code and prefix (so if you request a number that begins with +49 221, you'll need to provide documentation proving you live in Köln, Germany). We accept utility bills, an identification document (like a driver's license), a business license or a lease contract. We cannot accepts screen shots, business cards or letter head.


Worldwide SMS

Tropo applications can send SMS messages to any number in the world if the application has a SMS-enabled number attached to it. To ensure message delivery, you should send from an appropriate number for the destination.

Text messages sent to the US or Canada should be sent from one of Tropo's US SMS-enabled phone numbers. Standard local numbers in the US should only be used for personal communications. For automated application-sent messages, it's best to use one of Tropo's SMS-enabled toll free numbers. Tropo's US numbers can only send messages to the US and Canada and should not be used to send messages outside North America.

Text messages sent to a country where Tropo offers SMS-enabled phone numbers should be sent from a number in that country. Message delivery is always better when a message is from a number that's in the same country. The list of countries where Tropo offers SMS-enabled numbers can be found a few paragraphs earlier on this page.

If Tropo doesn't offer SMS-enabled numbers in the country you are sending to, or if you don't meet the address verification requirements for that country, we suggest that you purchase a SMS-enabled UK standard geographic number from Tropo and use that as your caller ID.

In some countries, a mobile carrier will change foreign SMS sender IDs to a local number or short code. When this happens, the recipient of your message will not see your Tropo application's phone number as the sender of the message, and will instead see this carrier-supplied phone number. This means they will be unable to reply to your Tropo application, as those replies go back to the carrier-supplied number instead of your Tropo number. This also means that they may receive messages from several different foreign senders that all appear to be from the same local telephone number.