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My way to eliminate Deutsche Telekom signal problems was to acquire GSM calls & 4G booster from MyAmplifiers
Derek Esch (Germany, Bad Arolsen)
Interrupted calls and unbearably slow Internet speed were forgotten with one of 4G GSM extenders
David Wenzinger (Switzerland, Fiesch)
I used to experience SFR signal problems while sailing before I got a marine 3g antenna.
Jean-Pierre Bouchaud (Martinique, Fort-de-France)
NS-GD-Boats-L is an excellent marine cellular booster for our needs.
Tom Hedges (Ireland, Waterford)