HTC One M9 - Manual (Page 253)

Global Services 240
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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 the numbers below if you need assistance:
While in the United States: Call 1-888-226-7212.
While traveling outside the United States:
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In GSM mode: tap and then dial 1-817-698-4199.
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In CDMA mode: enter the country code and then dial 1-817-698-4199.
There is no charge for this call from your wireless phone.
From a landline phone when outside the United States:
Sprint Worldwide Customer Support can be reached from a landline phone at 1-817-698-4199.
Access or connection fees may apply. The toll free numbers below can also be used to contact
Sprint Worldwide Customer Support in the following countries:
Country From Landline Phone
Caribbean (Anguilla, Barbados,
Cayman Islands, and Dominica) 1-888-226-7212
France 0800-903200
Germany 0800-180-0951
Italy 800-787-986
Mexico 001-877-294-9003
Trinidad and Tobago 1-800-201-7545
United Kingdom 0808-234-6616
Note: This toll free service is available on ordinary landline phones and some public pay phones.
This service does not cover any hotel access charges.