We definitely want to make sure you're getting the service you need! The 4S was a 3G device and the 6 is able to connect to 4G LTE. It's possible the bar display is different because it's reflecting your 4G LTE connection which was not available on your previous device. Are you noticing any different in call quality or trouble connecting to data? Which zip code are you in?
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Did you actually read what was written.
The poster stated his/her WiFi is slower not cellular data.
To original poster go here: http://www.apple.com/support/iPhone
There has been posts claiming that your router works on 2.4 MHz. Versus the 5 MHz. Available on A/C/B/G/N wireless routers.
See if a solution has been found other than switching to 2.4