My Simmons First credit card works again (starting today) with Android Pay. 
On 05-10-2016, I posted in this forum that my Simmons First credit card had stopped working with Android Pay.
Since posts to this forum are archived/searchable/(apparently highly rated) by Google, in order for me to be fair to Simmons First, I decided I should mention in this forum that my Simmons First credit card works again (starting today) with Android Pay.
Here's a URL for "Participating banks and supported cards for Android Pay:"
https://support.google.com/androidpay/answer/6314169
As I expected after looking at the list in early May, my American Express credit card is fully supported.
My Simmons First credit card is not a rewards card, so dunno if it is fully supported, but it works again.
To my mild surprise, Capital One is no longer on the list (it was in early May), although I don't really care.