Revision 1.0
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AT&T Prepaid (goPhone) SIM cards may be purchased at an AT&T retail location or from a
large number of online retailers (search “gophone SIM card”).
The SIM card will come with instructions for activating the card online and adding funds to the
card. The SIM card must be activated before you can transmit messages with the SMS100.
When this manual was written, there were two prepaid plan options:
•
The $25/month plan with unlimited text messaging
•
The 10 cent per minute plan (no monthly fee, but $0.20 per message sent or received).
Please check Maretron’s website for the latest information.
2.3.2 Installing the SIM Card
In order to use the SMS100, the SIM card must be installed into the SMS100. To install the
SIM card, please perform the following steps:
1) Remove the four screws from the bottom of the SMS100 enclosure.
2) Separate the top and bottom of the SMS100 enclosure.
3) Slide the lid of the SIM card socket to the “OPEN” position and flip up.
4) Slide the SIM card into the lid of the SIM card socket so that the gold contacts are
visible and so that the corner of the SIM card that is cut off is at the top of the SIM card
socket lid.
5) Close the SIM card socket lid and slide it to the “LOCK” position. Be careful not to force
the lid into position. It should close easily. If it does not, check the orientation and
alignment of the SIM card.
6) Reassemble the top and bottom parts of the SIM100 enclosure with the four screws
removed earlier, ensuring that the gasket is seated properly.
The SIM card is now installed.