This app was mentioned in 11 comments, with an average of 2.09 upvotes
Download a tuner app like [this](https://play.google.com/store/apps/details?id=jp.co.roland.bosstuner&hl=en_US&gl=US) one and retune your guitar.
I really like the boss tuner for some reason - It looks like the boss tuner pedal and has no annoying ads or pop ups, I suppose it might have less features than other tuner apps but it looks cool
https://play.google.com/store/apps/details?id=jp.co.roland.bosstuner
Neat!
But neater: https://play.google.com/store/apps/details?id=jp.co.roland.bosstuner
Not sure if it's you're genre, but I used to teach guitar. America's Horse with no name this guy is pretty decent as a tutor - ...has two easy chords and is a good confidence builder plus it helps that you can then spend some time working on the rhythm of your strumming hand.
There are apps - this is what I use - ... to help with tuning for free, they aren't amazingly accurate but they'll get you closer. Failing that there's tuning notes on YouTube this is literally the first one I found.
But if nothing else keep up the good work, have fun, thrash it out glad you're playing!
Boss has an app, looks just like a tuner pedal https://play.google.com/store/apps/details?id=jp.co.roland.bosstuner
Sensitive to background noise but its awesome
Boss have a tuning app that I've been using and I love it:
Android: https://play.google.com/store/apps/details?id=jp.co.roland.bosstuner&hl=en_AU
boss tuner not sure for you, got it on my phone and it works, simple with no issues.
I use the BOSS Tuner app on andriod for acoustic sometimes. Not the best, but works in a jam.