Wells Fargo & Co. said Wednesday that it’s taking a mobile deposit service that allows customers to deposit checks using their Android or iPhone devices nationwide.

The Mobile deposit Service allows customers equipped with one of the smart phones to deposit checks into eligible Wells Fargo accounts by taking pictures of the front and back of the check.

During an initial 15-state launch of the product between June and October, more than 600,000 checks were deposited by customers. Customers can use Wells Fargo’s Mobile Deposit through the company’s Wells Fargo Mobile app for Apple and Android devices.

Security precautions include not storing the customer’s credentials and check images on the mobile device and advanced encryption and security technology to mask sensitive information. The company urges customers to select “sign off” when they complete their financial transaction.