That's the most exciting part of this gaming journey. There are many ways to play and all of them depends on what's your intention. Many players use a mobile game just to have fun. This one could be used upon or without registration.
Also there are options to play for real money without any deposit using free spins (for slots only) or no deposit needed bonus (except the live dealers). These options are very admired and the maximum amount of free money is about 10-20 GBP or about 10-20 free spins.
The real money mode is much powerful, because it allows you to enter the full gaming lobby with all available money games, and get the biggest possible bonus. Every reputable casino offers the right to generate loyalty points or comp points. This means that you will earn points with every bet you make. Later, when you have enough points you can convert them to a prize, bonus or something else.
If you are very new to the mobile casinos, it's really good decision to make a virtual tour and see what are the games, what's possible, how everything is organized, where is the bonus section, how to reach the customers support and so on. In case that you are convinced what to play, just try them for free or watch a youtube video review, or a demo before you make a deposit.
Every mobile game has its own rules and details, that's normal. Nowadays we receive notifications for new games each and every month and it's a brilliant chance to play on something spectacular, nobody knows which one could be the lucky one. The interface of each game has tabs to play, to read guidance and to see what are the bonus opportunities.
However, everything depends on the type of game because the slots machines are full of details, 3-5 reels, a lot of paylines, many bonus symbols and scatters. The roulette has many alternatives like French, European, American, Sports and others. The video poker could be with different card types and options. It's a world, rich of mobile games.
The experienced players know very well what to play and how to do that, but there is no guarantee that you will not be surprised with some new bonus feature or big jackpot from the palm of your hand.