As far as you have your private keys is properly written down on a piece of paper, it doesn't matter if you are making use of Android or iPhone. The kind of phone you are using doesn't guarantee the safety of the crypto wallet if you don't have the private keys of your wallet address. I have seen people that have lost their gadgets but what saves them is that they were able to write down to private keys, with that they were able to retrieve it(crypto wallet) back to their new phone
Having your seed phrase (not private keys) written down a piece of paper gives you a back up and protects you against loss of your coins should your phone be lost or damaged. It does absolutely nothing to protect against theft of your coins. All hot wallets are more vulnerable to theft than cold wallets are, regardless of how good your back ups are.
You will be surprised to see that some old bitcoin users here are android users who have never been vulnerable because they are always cautious. It is more of a matter of how careful you are than the device or operating system that you use.
Pretty much this. I have used mobile wallets for small amount for years, and I have never had a single issue or lost a single satoshi because I use a reputable open source wallet, I don't visit random websites or click on random links, and I don't download a bunch of pointless spyware apps and games.
U don't think the person that told you is right, in terms of security I believe iphone is more secured than android
There is not a single open source iOS wallet which is reproducible from the published code, so no, iOS wallets are not more secure than Android.