Recent content by sgtm7

There are two types of single 3.5mm headphone jacks. TRS and TRRS. TRS is divided into 3 sections and only does headphone function with left and right channel. TRRS is divided into 4 sections and does headphone and microphone. Both the plug and the socket have to be TRRS capable...

Like others have mentioned, pretty much any smartphone will work with the wifi turned on and without a sim card installed. By the way it is "SIM" not "SIMM". SIMMs are memory modules that were used in computers before DIMMs came out.