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Q1: you can always re-use an old deposit address. By default, some cryptos like BTC will generate a new deposit address each time you click „receive“ on ledger live, but old deposit address remain valid forever.
Q2: the only thing you need to deposit is your deposit address. There is no need for anything else. And you can get your deposit address with your iphone if you have a Nano X. Once you have your deposit address, you can disconnect your ledger and even close ledger live, as they are not needed for the transfer to your account.
Q3: ioTex is a token that exists on the ETH and BNB/BSC chain, so you can send it to your ledger ETH address, using either the ETH or the BNB network.