Snapping these U.FL connectors can be tricky! Carefully line up the
little head of the connector with the "GSM" or "GPS" label, then press
down with your thumb or finger. It can be difficult to get enough force
from your finger, so once you have good alignment you may want to
use the blunt, rounded end of the cell antenna to snap the connector
in place.
We’re working on sourcing a good antenna for the MG2639. We’ve had
success with this patch antenna from Tagolas.
SIM Card
One of the hardest parts in getting the shield to work is finding a suitable
network and SIM card to run it on. You may be able to find a sweet,
contract-free deal like our T-Mobile 6-month Unlimited card.
Another option is to pick up a prepaid “burner” phone – like a Go phone –
and swap the SIM card into the shield.
The workings of the SIM card socket can take some getting used to. To
unlock the latch, push the top part of the assembly towards the battery,
then lift it up. Slide the SIM card into the moving part of the socket with the
SIM’s notch pointing away from the battery holder.
Then fold the arm back into the body of the socket, and gently push it
forward towards the “LOCK” position.
Connecting a Speaker and Microphone
To use the MG2639 as a cell phone, you’ll need to add some external bits
of hardware. The audio port, on the end of the shield, allows you to hook up
a speaker and microphone directly to the MG2639’s audio interface. The
audio port has six pins broken out for speaker, earpiece, and/or microphone
hardware. These pins are labeled:
•
EAR_SPK
– “Earpiece” speaker. This is a single-ended audio output
with 32
Ω
impedance. If using this interface, the other pin of the
speaker should be connected to ground.
SMA
CEL-08347
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