Linux on Cell phones

[luciped]

This is mainly out of curiosity so there is no rush but if anyone could tell whether there is a good open source or free linux that could be used as an operating system on a cell phone and still retain the abilities of the phone such as calling and texting through the service provider instead of just wifi and if there is, what would be a recommended cell phone with good enough specs to run the os?

 

[luciped]

Andriod doesn't count. I guess my question was incorrectly worded. It wasn't a practical question, it was more for knowledge, can you, yourself, not a cell phone with linux preloaded, install a version of linux, which is open source, onto a cell phone while retaining its capabilities as a phone and if so what is the minimum hardware that cell phone could have to run that linux?