Long time ago there was some Sony E******* devices that had connector for external antenna on the back side of the phone (e.g. K600, K790, K800). Now the phone vendors (Nokia, Sony E*******, HTC, etc.) does not add such option to their terminals.
Now Ascom asks the mobile vendor to create a terminal with external antenna connector for them and after that they sell it to you. If you bought a phone from Ascom without ext antenna you can contact them to check your option.
The Snapshots are just a TEMS Cases used to group phones, power converters, ...
for the external antenna If you can't find one, try just to use the phone as close as possible to the front glass of the vehicule, it's has almost the same effect as an external antenna,
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