My advice is to call TMO before the 11th and tell them that you won't be able to make your payment by the 11th and that you want an extension which will probably be less than 10 days. If that doesn't work which I highly doubt they would say no,
TMO sends a text message about 5 days after your bill is past due. You wait longer than that and chances are you'll be without service. Also, I'm sure they charge $20 to restore service because it happen to me. They once waive $100 reconnection fee because I have 5 lines.
This is what you should do if you can't pay it by the due date. Wait for the text from TMO which is usually about 5 days and they tell you "to avoid service interruption that you need to make a payment of blah blah". After that, call 611. Hit the option to check your balance/make a payment. The system automatically knows how many days you're past due. It will probably ask you if you want to make a payment or make payment arrangements. Choose to make an arrangement. Please note that making a payment arrangement through the automated system is only good for 7 days. So, if you make the arrangement tonight, you WILL have to pay the total due in 7 days. It will take you through the process and ask you if you agree with the arrangement.
Remember, this works if you have a checking account ONLY.
Now the next option is to call 611 and talk to someone and tell them that you can't make the full payment but you're willing to make a partial payment today and then 7 days after the remaining balance. They ONLY give you 7 days unless you're lucky to get more. A
gain, this is only if you have a checking account. If you're paying cash or credit card, I'd refer to the first sentence of the first paragraph.
How do I know this works? Well, I have done it a few times and it won't have an impact on your service at all. This works for me and it might work for you or anyone else unless you have screwed up in the past with them. Just make sure you have that money ready in your account when that date comes. That's the reason why I love TMO.
I apologize for the long reply but I hope it helps someone out.