More info would be helpful
That said, my preference is to install an external antenna/amplifier combo to bring in a weak signal. If there's no signal at all outside, you won't be bringing anything inside with the external antenna. YMMV.
The advantage of using one of the third party amp/repeaters (such as Wilson) is that they can work with more than one cellular provider, and are a one time up front charge vs being stuck with something from Verizon/ATT that only works with their system, and possibly has a monthly fee attached. Again, your specifics do matter to obtain the correct product for your needs/situation/location/budget.
Example of 4G product from Wilson that I have installed at multiple locations to improve indoor cellular service:
(*scroll down the page to 'technical details' to see how it is located in a dwelling.)
Hello! I can't use LTE in my house, the signal is very weak. Who knows do LTE boosters function?