I am not sure if this is what you are asking but, if all you want to do is to check your Cricket voicemail, all you need to do is:
1) call your Cricket cell nuraber from any phone.
2) when you get to your voicemail message press the "*" key
3) you will be asked to enter your password, enter your password
4) you will then be at the main menu of your voicemail just as if you called your voicemail from your cell phone
No there isn't. At least from what i understand after talking to a manager. Your supposed to call your phone nuraber and press "*" why would you need to do something other than that?