RoamingAdvisor.com Has Tested and reviewed the following Roaming Products for:

Cost of Recieving Calls
Local Calls
SIM Card Price
Initial Credit with SIM Card
Country of SIM Number
Text Message Charges
Data Roaming Charges

Roaming Advisor Supports The FCO’s Travel Advice Know Before You Go fco.gov.uk

Roaming Tools / Roaming Programs / Java Applications

Select the International Calling Code from the dropdown menu below to find the Country where the call originates from:

Select country you are visiting to, for the best roaming rates:

To find the international numbering format for a given country use http://www.briing.com

This product is also called

International access code lookup

International Calling Prefix table

International Number Format

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Mobile Operators to cut Roaming Charges on Text messages and Data Charges, "This evidence shows that text and data roaming prices have remained too high compared to the actual costs incurred by operators"