You have to follow these steps in order to use your phone in International Tips.

1.First thing is you have to contact your mobile service provider and ask whether your cellphone will support  in the country that you are going to  visit.

2.Ask  your  customer service representative if your service plan allows you to make international calls

3.Check the costs for Call and SMS . Most carriers charge a per-minute rate for international calls. The rate may vary, depending on the country. Costs for sending and receiving messages can vary as well. You can find this information on your carrier's website or by calling  the customer care.

4.Search the format for making local and international calls from the countries you will be visiting. You can find this information on the HowToCallAbroad.com website.

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