2N Lift8 v1.6.0 - Manual (Page 78)

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2N TELEKOMUNIKACE a.s., www.2n.cz
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9. Now insert the SIM card and connect the antenna.
Warning
While fitting the module, make sure that all the pins are fitted correctly
into the connector to avoid module damage.
Caution
In places with a poor signal quality find an appropriate place or use a
special (directional) antenna.
Should you have DTMF transmission problems, set parameter 710 to 1
(for GSM modules only).