Contact OneSimCard Live Customer Service

Live Chat

Ask your question online

If you were unable to find answers in our FAQ/Help page,

contact OneSimCard ASK YOUR QUESTION HERE and we will help you.


Call Us

Get 24/7 Technical Support by calling:
1-617-313-8888 (International)
1-800-640-2113 (U.S. - Toll Free)
1-800-640-2599 (Canada - Toll Free)
From a OneSimCard enabled phone:
Dial 096 and press Send
The first 3 minutes are free when calling Support from your OneSimCard enabled phone.
After 3 minutes, you will be charged the standard outgoing call rate from the country you are in.


Text Us

Will only work from a OneSimCard enabled phone:
Send an SMS to 00-1-617-600-8250
We will review your question and respond via SMS.
You will be charged the standard outgoing SMS rate for each text you send.
You will not be charged for any text responses you receive back from us.
Texts should be sent in English characters only and be no longer than 160 characters in length.
You do not need to include your OneSimCard phone number.


Fax Us



Mail Us

130 Trapelo Rd,
Belmont, MA 02478-0004


© 2006-2023 Belmont Telecom Inc., DBA All rights reserved