what to do when two elements have same resource id in appium?

In this case, you can use xpath or name like below:

Way 1:

driver.findElement(By.xpath("//android.widget.TextView[@text='Mobile Prepaid']"));
driver.findElement(By.xpath("//android.widget.TextView[@text='Mobile Postpaid']"));

Way 2:

driver.findElement(By.name("Mobile Prepaid"));
driver.findElement(By.name("Mobile Postpaid"));

Get the text using xpath:

String text = driver.findElement(By.xpath("//android.widget.RelativeLayout")).getText();

Compare the text and select the correct UIElement to perform desired action.

if(text.equals("Mobile Prepaid")){ ...... }

Take it with multiple elements for xpath for textview as

"//android.widget.TextView[@text='Mobile Prepaid']"

Hope it will work

You can use By.name like,

driver.findElement(By.name("Mobile Prepaid"));
driver.findElement(By.name("Mobile Postpaid"));

String ac = driver.findElement(By.xpath("(//*[@resource-id = 'account-balance-amount'])[1]")).getText();

String ac = driver.findElement(By.xpath("(//*[@resource-id = 'account-balance-amount'])[2]")).getText();