Nokia Lumia :: How To Disable 4G And Go To 2G

Is there a way to disable to the 4G in the Nokia Lumia 900 and use the 2G? I had an LG phone with 3G and got better coverage and signal bars on the 2G than I did on the 3G so I kept the phone on 2G. I don't use the internet on my Nokia ... I only use the phone for text messaging and phone calls... My 4G is only showing 2 bars on it's signal and sometimes maybe 3. I will have better signal on the 2G. How do I change the phone to use 2G.. since I do not use the internet/email or other internet services on it.