Yggdrasil was built to be fun, but it needs your cooperation to help keep it fun for everyone.
Since the phones can connect you to all sorts of different people, try not to say anything insulting or NSFW. You never know who will be on the other end!
If you make new friends with the phones, then go ahead and send them a friend request! Just make sure they're ok with it first. Nobody wants to add a friend just to get an ad from them.
Be yourself! Don't try to be anyone you aren't. Impersonation can be misleading and confusing. Yggdrasil Staff do use the phones, and Staff will have one of these icons:
Have fun! Jokes about calling a wrong number or ordering food are classics on Yggdrasil. See what else you can do to make people laugh!