If you want to buy a cell phone booster then one this you should always do is a brief research and one thing you should must know is that how much area you are willing to cover with boosted signal. Cell phone signal repeater comes in various models and each model has its own frequency and ability to cover area.
The area which can be covered by a booster use to be mentioned on booster box or manual usually you can always ask cell phone booster store experts for same. At this point i will personally advice you to buy a next level booster always.
What does “next level booster” means here?
By next level booster, i want to refer the signal booster model which comes just above the model which meets your requirements. If you want to cover 1000sqft area with boosted signal then my advise for you is to go for booster which has capability of covering 1500sqft. Reason for all this is that the area you are willing to cover may or may not have many obstacles in itself, like fat walls or hard iron work or any other thing which can disturb signal movement.
If you will get booster which is just matching you requirements then that booster may not fulfill whole area doe to such obstacles, that’s why it is advised to get a next level booster.