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I would think that a lot of that would depend on the app you are using - I would make sure that it doesn’t store data locally, and I would make sure to use a lock screen password on your device. The data you send to your bank is going to be encrypted, so it shouldn’t be exposed even if someone gets hold of the data during transmission. The bank is going to check the routing and account numbers to make sure it is legit before it ever gets published. So I would say that it is probably pretty safe to make deposits using your smartphone, but I’m not a security expert and I couldn’t swear to it.