My WiFi was horrible in my S3, I would sit in my dining room, 2 rooms down from my wireless router (have an apple extreme and the Fios wireless both up), connecting to either of them gets me only 2 bars and very crappy download speeds where all my other devices were getting full bars and very fast download/upload speeds. I would have to be pretty close to the router, next room over, for the bars to kick in and be at full strength, If I went in my Den further away, I would get 1 bar and no data pretty much, web pages took forever to load or failed to load, yet again on all the other wireless devices i have, lighting fast results. This is one of the couple of reasons I returned the phone, 1 too many issues to waist my upgrade so far, I will wait for the next phone or a fix maybe on the S3