Do you recommend using the phone or laptop or tablet to do these lessons? I have little 3 kids & I like to put lessons on the TV casted from my phone.

My ultimate recommendation is to do what you're saying and screencast (share) it to a larger screen such as a TV. That's what I do with my kids! But, for years I didn't have that option, so I would do whatever I had--on my phone, tablet, or laptop depending on the day or where we were (sometimes sitting in the car while one kid was doing a piano lesson or class!). I just wanted them to have some music education, and it worked.

I cannot find the "Teachable" app in Google play. I have Samsung phone. Do you have a picture of what the app looks like in the Google play store?

I just discovered that Teachable only has an iOS app at present. I hope they'll add one for Android phones soon! In the meantime, you can still log into your MIOH+ account on your phone and play the lessons for your kids through it. Https://MusicinOurHomeschool.com/calendar

It states that we'll have lifetime access, but that is if we only continue to pay the membership fee, right?