Mine does, what client are you using? I'm using Mycelium. If you are referring to the generic "Bitcoin" app, you probably shouldn't be using that one, let alone mining into it. It's very insecure and lacks PIN support, wallet differentiation, standard wallet import/export, and a ton of other functionality I would consider a "must" in a wallet. on-device encryption being really high on my list. Mycelium is also a lot easier to use. Oh, and Bitcoin for Android doesn't support the new wallet format (base-58) either, so it's not terribly useful outside of itself.
Why did you choose that wallet over a more secure/featureful/easy-to-use one like Mycelium? For reference, I use a combination of cold storage (paper) wallets (mining), hot wallets on my laptop in Armory, and a liquid wallet with a small balance that's available both in Armory on the computer and Mycelium on my phone, which is the only wallet I spend from.
I downloaded all the wallet apps to check them out. I don't keep a wallet on my phone, it's rather pointless at this point in time. Why do I need to walk around with bitcoins in my pocket(Bitcoin vending machines would be cool)? If I did find a use for a phone wallet, I'd take the "generic" app over mycelium or blockchain.info anyways. Why? It's decentralized. If the others go dark, you won't have access to your coins until they come back online or you migrate your private keys. Features? What features do you need for a pocket wallet? My actual wallet that I put real dollars in only folds in half. It also gives and receives. That's all you really need in a bitcoin pocket wallet. As for security, you can encrypt the private key. If someone, somehow got my phone when it is unlocked, they can't do jack except view my balance and transactions, unless I stupidly didn't encrypt. How much BTC do you keep on your phone anyways? How much money do you keep in your real wallet? Plus, if they did get my unlocked phone, they could do more damage with my non-pin protected email, google authenticator and texting. With the authenticator, they can see what accounts I use for 2 step verification. They'll have access to my email and the authenticator to reset passwords and access my accounts. They could really screw me over by reading my emails and discovering that I use coinbase. Go, to the site, forgot password, get text message, reset password, access, buy coins, and steal them.
So, the other wallets really don't one up the "generic" wallet. A pocket wallet should be generic and featureless like an actual real wallet. Lot's of features could lead to users making it their main wallet. Bad. I don't walk around with my savings account in my pocket. The generic wallet is secure and it sends and it receives, done. If anything, I hate the thought of having to rely on some third party to keep my wallet alive. Plus, they relay the blockchain. They could feed wrong information. Not that big of a deal other than your wallet balance would be wrong, but why not just connect to the actual blockchain.