Latest Facebook Messenger 146 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; U; Android 4.3; pt-pt; HUAWEI G6-L11 Build/HuaweiG6-L11C02B120) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 4 Ascend G6
Mozilla/5.0 (Linux; U; Android 4.2.2; pt-pt; ALCATEL ONE TOUCH 7041X Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.2 Mobile Safari/534.30 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 4 One Touch Pop C7
Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3003 Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.83 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 8 3
Mozilla/5.0 (Linux; Android 7.0; SM-J730F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy J7 Pro
Mozilla/5.0 (Linux; Android 7.0; SM-G950F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.107 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S8
Mozilla/5.0 (Linux; Android 7.0; SM-G935F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S7 Edge
Mozilla/5.0 (Linux; Android 7.0; SM-G930F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S7
Mozilla/5.0 (Linux; Android 7.0; SM-G920F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.83 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S6
Mozilla/5.0 (Linux; Android 7.0; SM-G920F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S6
Mozilla/5.0 (Linux; Android 7.0; SM-A520F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy A5 (2017)
Mozilla/5.0 (Linux; Android 7.0; SM-A310F Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.83 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy A3 (2016)
Mozilla/5.0 (Linux; Android 7.0; SAMSUNG-SM-G930A Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.83 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Galaxy S7
Mozilla/5.0 (Linux; Android 7.0; Redmi Note 4 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Redmi Note 4
Mozilla/5.0 (Linux; Android 7.0; PRA-LX1 Build/HUAWEIPRA-LX1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.107 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 P8 Lite (2017)
Mozilla/5.0 (Linux; Android 7.0; PRA-LX1 Build/HUAWEIPRA-LX1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 P8 Lite (2017)
Mozilla/5.0 (Linux; Android 7.0; MHA-L29 Build/HUAWEIMHA-L29; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Mate 9
Mozilla/5.0 (Linux; Android 7.0; F3111 Build/33.3.A.0.131; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/56.0.2924.87 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 Xperia XA
Mozilla/5.0 (Linux; Android 7.0; ASUS_Z017D Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.83 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 7 ZenFone 3
Mozilla/5.0 (Linux; Android 6.0; MYA-L41 Build/HUAWEIMYA-L41; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 6 Y6 (2017)
Mozilla/5.0 (Linux; Android 6.0; MotoG3 Build/MPIS24.65-33.1-2-16; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/64.0.3282.137 Mobile Safari/537.36 [FB_IAB/Orca-Android;FBAV/146.0.0.33.136;] Android 6 Moto G3