there are a large number of options avialable to you right now. the simplest one would be a litecoin dedicated mobile wallet (free wallet) you can find it on android googleplay market. or you could use the original litecoin wallet for windows. if you are looking to hold other coins, you should download a multycurrency mobile wallet like ETHOS. it supports a looooots of altcoins as well as bitcoins and you only have to save the main passphrase in order to back them all up. it is safe and convenient.