Latest Facebook 501 user agents:

User Agent Platform Device
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22F76 [FBAN/FBIOS;FBAV/501.0.0.49.107;FBBV/699723644;FBDV/iPhone13,4;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/en_GB;FBOP/5;FBRV/703296132;IABMV/1] iOS 18 iPhone 12 Pro Max
Mozilla/5.0 (iPhone; CPU iPhone OS 26_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23C71 [FBAN/FBIOS;FBAV/501.0.0.49.107;FBBV/699723644;FBDV/iPhone12,3;FBMD/iPhone;FBSN/iOS;FBSV/26.2.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/703296132;IABMV/1] iOS 26 iPhone 11 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D8133 [FBAN/FBIOS;FBAV/501.0.0.49.107;FBBV/699723644;FBDV/iPhone17,5;FBMD/iPhone;FBSN/iOS;FBSV/26.3.1;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/703296132;IABMV/1] iOS 26 iPhone 16e
Mozilla/5.0 (Linux; Android 9; SM-J330FN Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;] Android 9 Galaxy J3 (2017)
Mozilla/5.0 (Linux; Android 9; ZTE Blade V10 Vita Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/127.0.6533.64 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;] Android 9 Blade V10 Vita
Mozilla/5.0 (Linux; Android 9; ZT216_5 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;] FBNV/5 Android 9 ZT216
Mozilla/5.0 (Linux; Android 9; ZT216_5 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;] Android 9 ZT216
Mozilla/5.0 (Linux; Android 9; YK_P30 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 YK P30
Mozilla/5.0 (Linux; Android 9; V1945A Build/PKQ1.190626.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Y9s
Mozilla/5.0 (Linux; Android 9; V1941A Build/PKQ1.190302.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/132.0.6834.163 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 U3
Mozilla/5.0 (Linux; Android 9; UMIDIGI X Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 X
Mozilla/5.0 (Linux; Android 9; U70B Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 U70B
Mozilla/5.0 (Linux; Android 9; Trekker-X4 Build/PKQ1.190414.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Trekker-X4
Mozilla/5.0 (Linux; Android 9; TBBVNC100005208 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.121 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;] Android 9 TBBVNC100005208
Mozilla/5.0 (Linux; Android 9; T9S Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 T9 S
Mozilla/5.0 (Linux; Android 9; SUGAR_Y18 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.137 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Y18
Mozilla/5.0 (Linux; Android 9; SPC GEN PLUS Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Gen Plus
Mozilla/5.0 (Linux; Android 9; SM-T860 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Galaxy Tab S6 10.5" WiFi
Mozilla/5.0 (Linux; Android 9; SM-T837A Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Galaxy Tab S4 10.5"
Mozilla/5.0 (Linux; Android 9; SM-T830 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/133.0.6943.117 Safari/537.36 [FB_IAB/FB4A;FBAV/501.0.0.61.70;IABMV/1;] Android 9 Galaxy Tab S4 10.5" WiFi