I know there are many wallets for Android and IOS which is easy to use and safe. Coinomi is a good choice for Android users. This is just my personal choice and I wanted to know which wallet do you use on your mobile, why?

Coinomi is the best altcoin wallet. Coinomi supports many altcoins that no other wallet does. It has a build in exchange too.

Supported Coins (132!!):
Sorry I can't list all the names of the coin, go here to see the list https://coinomi.com/#supported-coins
Here is a screenshot of the beginning of the list:
http://www.auplod.com/u/dpualoa57ed.png
Most major coins are on the list.

Wallet type: Cold storage, encrypted
Android: Yes
iOS: Yes - Beta mode
Built-in exchange: Yes
Ease of use: Very easy, lightweight
Safety: Very Good
Open source: Yes
Website: https://coinomi.com



Source:
https://coinomi.com