Lets be real on this. There is I think no app for Iphone and there are some for Android. Some most be payed before download. So lets just compare some facts about this type of mining.
If you really considering mobile mining, then it’s important to think about all of the potential costs. First you need to buy phone i tablet for example, where price varies from brand name and quality. Comparing to mining rig this is cheap but so far this type of mining destroy or ruin your mobile device very fast. Only good this for this is that you can place them anywhere and you can take them anywhere cuz they use WiFi as connection for this, back side is data loss in this situations. Also power for this you will need to have your devices on charger all the time. If with all this you are still in mood for mobile mining then Electroneum option seems good but only if the value per Electroneum rises significantly later on. Cuz for this coin mining app is more then good and have good reviews (so far that I read).
If we make some crossing on this what is better and what is not, then it will take loot of time and effort for phone manufactures to create some good and suitable device for mining. Apps are here only devices are thing that are needed. But far better for now is so called traditional mining.
https://bitcointalk.org/index.php?topic=2635236.0Try this app, is a different project, a new algo, doesn't ruin your mobile battery
take a look at their topic