SCAM WARNING. Be very careful if you want to use Mycelium like a tool to sell and trade. Its full of scamers. Encountered 3 in two days. Whoever will try to persuade you to do the PayPal trade is scamer. Only trade with people who do actually want to meet. Got myself caught once. Be extra cautious when using it. It really needs multi signature if its to be used in future..
As the name implies it's for local trading, i.e. meet up. PayPal and Bitcoin have never mixed. Multisig will not fix the PayPal problem.
I get requests every once in a while from users nowhere near my location. I always point out that the feature is meant for local trades and that I'd be happy to trade the next time they are in my vicinity and can meet in person.