The Siemens SL10 is a

mobile phone A mobile phone or cell phone is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones ( landline phones). This rad ...

with a four-color screen (red, green, blue, and white). It was the second mobile phone with a multicolor screen after the Siemens S10 as well as the first sliding (where the display slides up) mobile phone.

References

SL10 Mobile phones with infrared transmitter {{mobile-phone-stub