Get Mycelium on your phone. Get Electrum or Armory on your PC. When you keep Bitcoin in exchanges like BIttrex, Poloniex and Coinbase, you don't actually own your Bitcoin. You are entrusting it to a third party who is subject to hacking or legal action. The recent Bitfinex incident should make clear to you that unless you keep your Bitcoin keys either off-line or on your own hardware, all your cryptocurrency holdings are at-risk for theft (whether by government or private criminals.)