how can i fix my mobile phone?

i wanted to unlock my phone to any network and i used one of the codes of the internet to give me a security menu on my phone but a security menu didnt come up something called eng came up and now i cant get to anything on my phone but if i type a number in i can ring people and if someone sends me a message i can read it but i cannot access anything else it just has a load of writing on the front of my screen

melanie gregory
February 2010