Siemens S25

It is a very good mobile, if you need the extended features compared to C25.

my experiences

version 05
++

very small, very handy, not to lightweight 

good speech quality

good receive and transmit power

very easy usable / good menu structure

ring tones off with only one key pressing

key lock with only one key pressing

support for Viag functions (city, genion ...)

different ringtones for VIP or "normal" call

during text input - displays the list of characters available with the pressed key

automatically case switching during input of names for directory entries

--

bad structured short manual

initial greeting message after PIN (for telephon number or address, if phone was lost) 

no recognition of more than one SIM for SIM lock (Viag has 2 SIM on one card --> telephone code is needed if Swisscom PIN is used) 

only one short message center (SMSC) storable

bad keys (compared with C25)

no guarantee for completeness / mistakes ;-)