When you spend from an offline bitcoin paper wallet, you are advised to spend all funds, sending the amount you want to send to the recipient address and sending the remaining bitcoin to a newly created offline paper wallet for safekeeping.
Is this technique also advisable if you are spending from a XEM address created on a mobile (Android) wallet? Or is it safe to send from the mobile wallet and leave the remaining XEM in the same address which you spent from?
Bumping this up again, still no replies 
The bitcoin example always means that the secret key is in the Cold Wallet(= Paper wallet).
The secret key always means that it is on paper, which is not subject to hacking.
NEM’s mobile wallet will be a hot wallet. Although a properly encrypted secret key is stored in the wallet, it can not overcome the secret key stored in paper.
If your smartphone is hacked, it can not be said that there is no fear of being decrypted.
Likewise, NEM also has a paper wallet.
By using this, it is possible to have the same security level.
(I think content thread here is good, but Tech Support’s writing has priority.)
thanks
Thanks mizunashi…So would I be correct in saying that the level of safety of an account on android mobile device is not decreased after sending XEM to another address? There is no increased risk after spending from a mobile wallet for the first time, the risk is the same as with an account that was created, funded, but never used to send out funds? Is that right. So to decrease risk for an android mobile wallet account, the best thing you can do is delete the cache and data and uninstall the app? Sending all funds out to a new android mobile account would not do anything to decrease risk? Is this correct?
Thanks for suggesting paper wallet, I didn’t know NEM had one.
Difference between a mobile wallet that is not transmitting and a mobile wallet that has sent.
That is the difference on whether there is a record of public key and address on the block chain.
Currently, there is no way to find the secret key from the address and the public key created by the mobile wallet.
It is impossible in terms of time with current computer technology to search for secret keys on a round-robin basis.
However, leakage of encrypted private key by hacking is problematic.
This is the login password of the mobile wallet because the secret key is encrypted.
The strength of the encrypted secret key is directly related to the strength of the login password.