TextSecure requires proprietary Google applications and this is deliberate: http://support.whispersystems.org/customer/portal/articles/2123166-why-do-i-need-goo

TextSecure requires proprietary Google applications and this is deliberate: http://support.whispersystems.org/customer/portal/articles/2123166-why-do-i-need-google-play-installed-to-use-textsecure-on-android- http://support.whispersystems.org/customer/portal/articles/2... SMSSecure is an acceptable alternative (for text messages), available on F-Droid.