I believe that I am the first poster with GPS, since 2016. While admire posters for suggesting cost savings units the cheap ones, such as Ed linked to are based upon 3G technology. This will be going away. If you are going to install one use a 4G based model. The downside is you will almost certainly pay a monthly fee, typically 8.00 a month.
End Could Be Near For 3G In The United States