So hangouts is the default texting app on nexus 5 and ever since the 5.0/5.1 updates this app is complete garbage. When someone is sending me a text the app locks up and will not let me send any messages, so sometimes I literally have to wait 10 min for a message to show up before I can reply or send any text message, even the call history won't show up in the phone app while there are incoming text messages.