The SOL for a written contract is 6 years but the SOL for an open ended is 3 years in Georgia. I am not sure but a cell phone account may be open ended like a credit card you will have to check that out.
A written contract is an agreement made on a printed document that has been signed by both the lender and the borrower.
An open-ended account is an account that has a varying, revolving balance.
For Oklahoma the SOL is 5 years for written contracts and 3 years for open ended accounts.