Latest Vivo Y81s user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 8.1.0; vivo Y81S Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.180 Mobile Safari/537.36 Instagram 419.0.0.49.71 Android (27/8.1.0; 320dpi; 720x1520; vivo; vivo Y81S; 1808; mt6762; en_US; 896334216; IABMV/1)	Instagram 419	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732t Build/v1732t) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/4.0.8 Mobile Safari/537.36	Chrome Webview 4	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732t Build/v1732t ) AppleWebKit/534.30 (KHTML,like Gecko) Version/5.1 Mobile Safari/534.30	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; vivo v1732a Build/v1732a.171019.019;) AppleWebKit/537.36 (KHTML,like Gecko) Version/4.0 Mobile Safari/537.36	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732a Build/v1732a) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.51.1	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; vivo v1732a Build/v1732a) AppleWebKit/537.36 (KHTML,like Gecko) Version/4.0 Mobile Safari/537.36	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; vivo v1732a Build/v1732a) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 OPR/12.14.0.2 Mobile Safari/537.36	Opera 12	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732a Build/v1732a) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732a Build/v1732a) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/4.0.8 Mobile Safari/537.36	Chrome Webview 4	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; vivo v1732a Build/v1732a ) AppleWebKit/534.30 (KHTML,like Gecko) Version/5.1 Mobile Safari/534.30	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; V1732A Build/O11019) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 UCBrowser/12.6.0.1040 Mobile Safari/537.36	UC Browser 12	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; zh-CN; V1732A Build/O11019) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/100.0.4896.58 Quark/6.4.5.332 Mobile Safari/537.36	Quark 6	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; vivo Y81S Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.110 Mobile Safari/537.36 OPR/84.0.2254.73823	Opera Mobile 84	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; vivo v1732a Build/v1732a) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.51.1	Android Browser	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; pt-pt; vivo Y81S Build/O11019) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.126 Mobile Safari/537.36 PHX/16.3	Phoenix Browser 16	Android 8
Mozilla/5.0 (Linux; U; Android 8.1.0; en-US; V1732T Build/O11019) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 UCBrowser/13.1.2.1293 Mobile Safari/537.36	UC Browser 13	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo Y81s Build/OPR5.170623.011) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36	Chrome Webview 66	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo Y81s Build/OPR3.170623.008) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36	Android Browser	Android 8
Mozilla/5.0 (Linux; arm_64; Android 8.1.0; V1732A) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 YaBrowser/21.3.3.153.00 SA/3 Mobile Safari/537.36	Yandex Browser 21	Android 8
Mozilla/5.0 (Linux; arm_64; Android 8.1.0; V1732A) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.127 BroPP/1.0 SA/3 ru.yandex.searchplugin/20.91.200901053 (vivo V1732A; Android 8.1.0) ZenKit/2.8.1.2-searchapp-Zen.7413 Mobile Safari/537.36	Zen 2	Android 8