I'm lookin more towards Rick knowing why Lori did what she did, and having had Carl kill her off. Though he might feel angry for a bit about Carl having to do it, Rick's a strong guy and will realize the decision. Though if Rick does go to pieces for a few episodes, Well there's Daryl!, Hes been with the group and has awesome instincts to make solid decisions!
The prison has its own separate generator that powers the prison, so its quite possible the land lines are still working to dial and receive calls. It'll be different to be a part of the main char's downward spiral into madness, after all he is human and we all have a breaking point, so would make him even more of a believable character!