Also Each cellphone tower has a Range of Frequencies, Soo when Your Signal Is low It Changes to Next cellphone tower Soo Your Signal it's NOT Affected! Sooooo, If You don't Have to Many Rent cellphone tower has a Company, You Must use More power for your Frequencie gets to The Next rented cellphone tower! Hahaha That's Why people Say, Ahhh My phone has Low Signal! ;)