Now i'm out of the U.S. for more then 3 month.

Hello!

Now i'm out of the U.S. for more then 3 month.

My current plan is "$3 Daily UL Tlk Txt Wb (200 MB 4G)".

What should i to do to not lost my phone number?

And how long i could leave my phone without money?

(Now i have 0 dollars on it)

Thank you!