iv put my sim card in a galaxy S5 from a galaxy s3 but my signal is poor and also the Internet signal why??

[gshiels]

iv put my sim card in a galaxy S5 from a galaxy s3 but my signal is poor and also the Internet signal why??

 

[Titillating]

Could be any number of reasons, including your physical location. This is something you're probably best off calling your service provider about, in case it is an issue on their end.