Latest Facebook 538 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 14; RMX3938 Build/UP1A.231005.007; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 14 Note 60x
Mozilla/5.0 (Linux; Android 15; 23021RAAEG Build/AQ3A.240829.003; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] FBNV/500 Android 15 Redmi Note 12
Mozilla/5.0 (Linux; Android 13; 23028RNCAG Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.80 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 13 Redmi A2+
Mozilla/5.0 (Linux; Android 13; 2201117TG Build/TKQ1.221114.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] FBNV/500 Android 13 Redmi Note 11 4G
Mozilla/5.0 (Linux; Android 12; ZTE Blade A53 Build/SP1A.210812.016; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 12 Blade A53
Mozilla/5.0 (Linux; Android 14; DS-CL4 Lite Build/UP1A.231005.007; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.159 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 14 Cygnal 4 Lite
Mozilla/5.0 (Linux; Android 11; TECNO KG8 Build/RP1A.200720.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 11 Spark 8 Pro
Mozilla/5.0 (iPhone; CPU iPhone OS 15_8_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/19H394 Safari/604.1 [FBAN/FBIOS;FBAV/538.1.0.47.78;FBBV/820060808;FBDV/iPhone9,4;FBMD/iPhone;FBSN/iOS;FBSV/15.8.5;FBSS/3;FBID/phone;FBLC/en_Qaau_GB;FBOP/5;FBRV/825747641;IABMV/1] iOS 15 iPhone 7 Plus
Mozilla/5.0 (Linux; Android 10; M2004J19C Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/83.0.4103.101 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;] Android 10 Redmi 9
Mozilla/5.0 (Linux; Android 14; V2310 Build/UP1A.231005.007_NONFC; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] FBNV/500 Android 14 Y17s
Mozilla/5.0 (Linux; Android 15; moto g05 Build/VVTAS35.51-137-2-1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 15 Moto G05
Mozilla/5.0 (Linux; Android 10; MED-LX9 Build/HUAWEIMED-LX9; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/92.0.4515.105 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;] Android 10 Y6p
Mozilla/5.0 (Linux; Android 15; V2427 Build/AP3A.240905.015.A2_V000L1; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 15 V50
Mozilla/5.0 (Linux; Android 10; Infinix X680B Build/QP1A.190711.020; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 10 Hot 9 Play
Mozilla/5.0 (Linux; Android 15; SM-S901W Build/AP3A.240905.015.A2; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/142.0.7444.94 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] FBNV/500 Android 15 Galaxy S22
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/22F76 Safari/604.1 [FBAN/FBIOS;FBAV/538.0.0.35.78;FBBV/818305441;FBDV/iPhone17,5;FBMD/iPhone;FBSN/iOS;FBSV/18.5;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/0;IABMV/1] iOS 18 iPhone 16e
Mozilla/5.0 (Linux; Android 11; B131DL Build/RP1A.200720.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 11 View 2
Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/20G75 Safari/604.1 [FBAN/FBIOS;FBAV/538.1.0.47.78;FBBV/820060808;FBDV/iPhone11,8;FBMD/iPhone;FBSN/iOS;FBSV/16.6;FBSS/2;FBID/phone;FBLC/en_US;FBOP/5;FBRV/825747641;IABMV/1] iOS 16 iPhone XR
Mozilla/5.0 (Linux; Android 16; SM-A546V Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/145.0.7632.120 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/538.0.0.53.70;IABMV/1;] Android 16 Galaxy A54 5G
Mozilla/5.0 (iPhone; CPU iPhone OS 26_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/23D127 Safari/604.1 [FBAN/FBIOS;FBAV/538.1.0.47.78;FBBV/820060808;FBDV/iPhone14,8;FBMD/iPhone;FBSN/iOS;FBSV/26.3;FBSS/3;FBID/phone;FBLC/en_US;FBOP/5;FBRV/825747641;IABMV/1] iOS 26 iPhone 14 Plus