Some mobile companies are genuinely thinking about pre-installing a Cryptocurrency wallet that would be something that people could use and it would be secure too ,
Do you really think, anything pre-installed by any corporations this days can be trusted or secure? There are plenty of example of privacy rights violation involving mobile brands like HUAWEI. There might be backdoor on this so called secure cryptocurrency wallet through which government can take control over your coins if they suspect you being involved with anything illegal or even when you receive flagged coins for legal services you provide.
at the same time you should understand that you can opt for the hardware wallets which are made by various companies and the most trustable one is the Ledger which is primarily a French startup .
Even hardware wallets can be tempered on the way to you if you are buying from some third party services.
Most secure way to get offline wallet is old paper wallet, print it from offline computer + printer running paperwallet script in your newly formatted pc/laptop's browser.
