The best way to improve your smartphone videography is to add a 3-axis gimbal stabilizer to your shooting kit, and now you can pick one up for under $50.
For Black Friday, the Zhiyun CINEPEER C11 is discounted from the usual price of $89.99 to $42.63!
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Sale price is $51.15, but the by using the coupon code C11BKQMO you bring the price down to $42.63.
If you need a beefier gimbal, I recommend taking a look at the Zhiyun Crane M2. It's bigger, stronger, and designed for heavier loads.