These days a lot of people have smartphones. I think maybe only my parents have slim phones that only make calls and receive text messages.
Most people use their smartphones for games or internet surfing or email. Some people use them to time their runs and record how many miles they have run. However, there is a great tool for language learners that doesn’t need you to install an app. It can help coach your pronunciation. Your new speaking coach is the voice input tool. Every smartphone has one and this is how you use it.
First, open your notepad app, make sure your input language is English then click the microphone for voice input.
Next, speak, and wait for your phone to type what you said.
If the words look like what you said, great.
If not, keep practising.
Voice input is rarely perfect but it is often very good, even if I use my hometown accent. Keep practising and you can have more accurate pronunciation.