Latest Facebook 311 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7 2020RU Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Blade A7 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A7 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Blade A7 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Blade A5 (2020)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A5 2019 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Blade A5 (2019)
Mozilla/5.0 (Linux; Android 9; ZTE Blade A3 2020 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/90.0.4430.82 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Blade A3 (2020)
Mozilla/5.0 (Linux; Android 9; Xperia X Compact Build/PQ3A.190801.002; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.89 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Xperia X Compact
Mozilla/5.0 (Linux; Android 9; X19 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 X19
Mozilla/5.0 (Linux; Android 9; W-V800-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 View 3 Lite
Mozilla/5.0 (Linux; Android 9; W-V720-EEA Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Y80
Mozilla/5.0 (Linux; Android 9; W-K510-EEA Build/PPR1.181008.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Y60
Mozilla/5.0 (Linux; Android 9; VIEW 1 Build/P00610; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 View 1
Mozilla/5.0 (Linux; Android 9; Ulefone_Note 7 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Note 7
Mozilla/5.0 (Linux; Android 9; TECNO CC6 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Camon 12 Air
Mozilla/5.0 (Linux; Android 9; STF-L09S Build/HUAWEISTF-L09S; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Honor 9
Mozilla/5.0 (Linux; Android 9; SNE-LX3 Build/HUAWEISNE-L03; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Mate 20 Lite
Mozilla/5.0 (Linux; Android 9; SM-S367VL Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.96 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Galaxy J3 Orbit
Mozilla/5.0 (Linux; Android 9; SM-N950F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Galaxy Note 8
Mozilla/5.0 (Linux; Android 9; SM-J260AZ Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/78.0.3904.96 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Galaxy J2 Pure
Mozilla/5.0 (Linux; Android 9; SM-G960F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Galaxy S9
Mozilla/5.0 (Linux; Android 9; SM-G950F Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/89.0.4389.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/311.0.0.44.117;] Android 9 Galaxy S8