I installed a Wilson DT booster a year ago and gained at least one bar at all times. I do still lose a call now and then, but nowhere near as often as I used to.
The DT does however require mounting an external antenna and connection to your modem. I mounted it to a 3 foot pole attached to the septic vent on my roof and ran the lead into the house right alongside the vent pipe. The antennae was aimed directly at my strongest cell tower using a free phone app called "OpenSignal". Not quite as easy as full wireless, but it was relatively inexpensive, easy to install, and most importantly... it works!
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