No! Electroneum is not a scam, I already bought it and waiting for november 1 for their project. Able to mine in our mobile phones and this is great. I love their concept.
You will not mine with your mobile phone. Have you read the technical white paper?
Definitely not mining but a mining experience.
Truthfully, who gives a fook if its mined or not, you will be getting free ETN anyways. I prefer to get free ETN without really mining

Cheaper.
And how much do you think free ETN are worth?
1 million dollars (sarc.)

Thanks for the sarcasm, but the true answer is zero.
The purpose of mining is that you reward miners for making a valuable job.
If the mobile miner does not mine at all, then his work has no value, and the ETC coins they get as reward are worth zero.