My phone has a fingerprint lock and others but those security men I don't trust them, there is also a company PC in the office at the checkpoint, I feel they might try something with my phone and as a hot wallet user I feel unsafe.
Buy another phone to store your bitcoins if you cannot afford a hardware wallet yet. If you cannot buy another phone but have an old phone, you can use it as an alternative to a hardware wallet for the time you can get a hardware wallet. The second phone should be used strictly for storing your bitcoins and you should also limit the the usage of that phone on the internet to reduce security risk.
How to use an old smartphone as Cold Storage.
STEP 1
(a) Remove the SIM card if your phone has one. You don’t want any cellular communications, only WiFi.
(b)Perform a factory reset. This is typically found under Settings/Backup & Reset. This procedure wipes all personal data from the device and returns it to a factory state. Obviously back up anything you need before hand.
(c)After resetting the device and connecting to your WiFi (make sure your WiFi is password protected), you will have to log in to a Google account during the setup process. Do not use an existing account. Instead, create a new account with a fake name. Save the details of the account for later. This new account is to be used for absolutely nothing but tasks related to interacting with this device. Also during setup, don’t back up your phone to Google’s servers, don’t select to stay up to date, and don’t add any billing information. When it asks you to secure your phone, choose PIN and make sure it’s at least 6 digits long; I use 10. Remember, this isn’t about convenience, it’s about security. When prompted, choose to not show notifications when the device is locked. Lastly, don’t enable any of the offered services like backups, location, bug reporting, etc.
Once the phone is done setting up your profile, turn off data communications. On most Android phones, swipe down twice from the top of your screen to bring down your quick menu. Click on the icon for your data or cellular connection and then disable mobile data.
(d)Go into Settings/Apps, swipe over to All, and uninstall or disable every app that isn’t explicitly needed for using the device for offline storage. If in doubt, leave enabled all of the apps with the green android avatar. Also leave enabled Google Play, Google Play Services, and Google Keyboard. Don’t worry, if you accidentally disable something you need, it can always be re-enabled; just make sure you’ve tested everything before you start moving the bulk of your coins to the device. It’s also a good idea to reboot your phone before moving on to the next step.
(e)Go to Settings/Security. Set it to automatically lock after sleep. Enable the “Power button instantly locks” option, disable “make passwords visible”, and disallow installation of unknown sources
(f) Finally, encrypt your phone. There should be an option on the Security page. It will warn you that encryption will take a long time but since there’s hardly anything installed or stored on the phone at this time, it will only take a few minutes. If the option to encrypt isn’t available, don’t use this device. If you can’t encrypt your device, your security is highly compromised and isn’t worth the risk and you’ll be better off using something else.
After that step;
(a) Install a VPN client. A VPN (virtual private network) encrypts and routes all data coming and going to and from your device through a proxy server masking your IP address. If your VPN allows for it, set it up so that if the VPN loses connection, it will kill your network connection and prevent any unencrypted data from leaving your phone.
(b) Install a password manager like Last pass or any other one with good rating and review.
(c)Install wallets. There are a number of wallets available on the Android platform, all with different features. Do NOT use a hosted wallet app such as Coinbase. Using a hosted wallet completely defeats the purpose of using your device for offline storage. When choosing your wallet, always try to choose wallets that offer a 12 word recovery phrase.
After all this, it is still recommended that you turn off the phone, and remove the battery to keep safely when not needed.
(the guide is for android device)
https://steemit.com/bitcoin/@anarcrypt/how-to-set-up-a-smartphone-for-cold-storage