Chatr allows their users to put their account on dormant mode for a maximum period of 6 months before their phone number and account will be permanently deleted. For that, you will have to call the Chatr customer service by dialing *611 from your phone (Only if you currently have an active Chatr phone connection). Tell them that you will need to put your phone account dormant for 2 months. If you have a money balance in your phone account, the customer representative will strangely charge you the regular monthly amount, on the day you called to put your account dormant, then when you return from your vacation, you call again and they will credit back the previously charged amount. I don't know why they do this.
Or what you can do otherwise, is to unenroll yourself from the Auto pay feature and remove your credit card information from your Chatr phone account. You will need to call customer service for unenrollment of your auto pay credit card. Then when your payment due date anniversary arrives, they won't be able to charge you any money since you already unenrolled your credit card from auto pay account. Your phone connection with Chatr will be disabled for the maximum of 6 months. If you come back after 2 months, you can simply call customer service again and tell them that you want to reactivate your same phone number and account with Chatr.