Can you I'm people on sl through a cellphone ?

[Vogue14x]

Without signing inworld into sl , is it possible to talk to yur friends if yur on a cellphone ?

[Rolig Loon]

No, but there's always Skype.  Your options with a cellphone are very limited.  There are some text-based viewers that will let you log in to SL, carry on IM and chat conversations, handle inventory, and do some other basic SL functions, but without any graphics  >>> http://wiki.secondlife.com/wiki/Third_Party_Viewer_Directory . For a while, LL also offered an application that would allow you to make telephone calls to RL from SL, but not the reverse.  AFAIK, however, that feature no longer exists. 

ETA: Of course, you can send Private messages through my.secondlife.com without being logged in, so if you have browser access on your phone, that's an option.

[Lindal Kidd]

You can't text them or give them a voice phone call...but if you have an iPhone or an Android smartphone, you can log in to SL with several different apps.  My current favorite is Lumiya, which actually gives you a limited 3D view of your surroundings.