Latest Opera Mobile 28 user agents:

User Agent Platform Device
Mozilla/5.0 Linux; U; Android 8.0.0; ZB555KL Build/OPR1.170623.032; wv AppleWebKit/537.36 KHTML, like Gecko Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 ZenFone Max M1
Mozilla/5.0 (Linux; U; Android 9; vivo Z3x Build/PKQ1.180819.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.101 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 9 Z3x
Mozilla/5.0 (Linux; U; Android 9; TECNO CC9 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 9 Camon 12 Pro
Mozilla/5.0 (Linux; U; Android 9; Neffos C7s Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.99 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 9 C7s
Mozilla/5.0 (Linux; U; Android 9; BV9100 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 9 BV9100
Mozilla/5.0 (Linux; U; Android 8.1.0; TECNO LB6 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.110 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 8 Spark 2 Youth
Mozilla/5.0 (Linux; U; Android 8.1.0; TECNO B1 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.110 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 8 Pop 2
Mozilla/5.0 (Linux; U; Android 8.1.0; PYRO_7_PLUS_3G Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/81.0.4044.138 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 Pyro 7 Plus 3G
Mozilla/5.0 (Linux; U; Android 8.1.0; N570 Build/OPM2.171019.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/109.0.5414.117 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 Ursus N570
Mozilla/5.0 (Linux; U; Android 8.1.0; KING_KONG_3 Build/O11019; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/80.0.3987.99 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 King Kong 3
Mozilla/5.0 (Linux; U; Android 8.1.0; itel W5504 Build/OPM2.171019.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/88.0.4324.181 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 P33
Mozilla/5.0 (Linux; U; Android 8.1.0; CAG-L02 Build/HUAWEICAG-L02; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 8 Y3 (2018)
Mozilla/5.0 (Linux; U; Android 7.1; vivo X510t Build/KTU84P; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/33.0.0.0 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 7 X510t
Mozilla/5.0 (Linux; U; Android 7.1.2; Hisense Infinity H11 Build/N2G47H; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/76.0.3809.132 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 7 Infinity H11
Mozilla/5.0 (Linux; U; Android 7.1.1; MX6 Build/NMF26O; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2074.203 Mobile Safari/537.36 OPR/28.0.2254.119224 Android 7 MX6
Mozilla/5.0 (Linux; U; Android 7.1.1; F5122 Build/34.3.A.0.244; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.111 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 7 Xperia X Dual
Mozilla/5.0 (Linux; U; Android 7.0; vivo Y17T Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 OPR/28.0.2254.119224 Android 7 Y17T
Mozilla/5.0 (Linux; U; Android 7.0; TECNO WX3 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/58.0.3029.83 Mobile Safari/537.36 OPR/28.0.2254.119114 Android 7 WX3
Mozilla/5.0 (Linux; U; Android 7.0; MITO A17 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.98 Mobile Safari/537.36 OPR/28.0.2254.119214 Android 7 A17
Mozilla/5.0 (Linux; U; Android 7.0; itel S21 Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.101 Mobile Safari/537.36 OPR/28.0.2254.119213 Android 7 S21