The instructions are here: http://www.gl-inet.com/download/mifi/
Some common problems:
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Make sure the module support your SP
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When you install the SIM card, be gently. Don’t twist and bend the pins. Please check the picture.
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Read the "quick start guide here: http://www.gl-inet.com/download/mifi/
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When you have problem, post your problem here. We will try our best to help!