You will not be able to convert any of the BEP2 tokens since you do not own the base currency of binance>BNB is gas or fee for The Binance Network You can buy BNB from a provider at Trustwallet or buy from an exchange.
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but there is no way that I can pay the fees with the coin that I want to sell?
Trust Wallet is a decentralized non-custodial wallet and all fees you pay are directly with the underlying Blockchain you want to use.
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