Yesterday I start with smart contracts and deploy a simple one at the testnet. Only downloaded latest version of the wallet and clicked button to upload the smart contract. Is it possible to reach it by the mobile using nethereum or have I to run a private testnet where I have to set RPC while running geth?
There is a mobile application called Jaxx where you can send or receive some ethers. It supports also smart contracts as well. And in bonus, the code is open source so you can fit according to your needs.