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1. Buy a wallet that has a "key loop." I have one. I bought it at the Travel Store at the mall. Attach your keys to your wallet. From now on, any time you pick up your wallet or keys, you will have your keys and your wallet.
2. Always put your wallet and attached keys in your front, left pants pocket. And put change in that pocket, so that the hard change will not bump agaist you cell phone, and change its settings.
3. Always put your cell phone in your right, front pants pocket, along with cash bills.
This is enough for now. If you want to go further, buy a book, "The Packing Book." Re-do your entire wardrobe according to that book's instructions for a trip wardrobe. More questions? Probably Cary can put you in e-mail touch with me.