Samsung Galaxy S4 User Manual page 133

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Try manually selecting another network. Information for selecting networks can be found
in the phone guide.
If neither of these actions resolves your issue, you will need to contact customer service (see
below). When calling to report an issue, the following information will be beneficial in trying to
resolve your issue as quickly as possible:
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Your wireless phone number.
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The city and country you are traveling in.
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Any error message that displays on your phone or that you heard when trying to place a
call.
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If the issue is with data, were you able to place voice calls?
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If the issue is with voice service, were you able to access data?
Please call your wireless service provider if you need assistance.
Sprint Worldwide Wireless Service 121