I was helping someone else who could not get the "send text" app to show up on her Pebble App... but she was using an iPhone. I don't know if this information is applicable to the Android users or not but I found this in an previous FAQ.
I found this, this morning, while trying to get more familiar with the
Pebble Time features/capabilities. It was dated June 2016. I have
inserted a screen snap of my phones settings page...
see below the FAQ.
Frequently Asked Questions
Why can't I see the text features on my Pebble?
Texting features are only for the Pebble Time, Time Steel and Time
Round. These features were introduced over separate firmware
updates, so please make sure that your watch's firmware is current.Texting features for iOS are currently available only for Verizon or
non-prepaid AT&T users, and only for the Pebble Time, Time Steel and