At present, two telecom dual-card mobile phones are dual-card dual-mode, that is, the main card uses a telecom card and the auxiliary card uses a mobile phone. Dual-card single-mode telecom mobile phone, that is, a mobile phone with two telecom cards inserted into two card slots at the same time, is temporarily unavailable. You can check the latest version of telecom mobile phones in Tianyi Store, the online business hall of Anhui Telecom. If the dual card single card mode is selected during screening, there is no such mobile phone.
Letter version of the contract machine, as long as the dual-card mobile phone can support 1 card telecommunications network, card 2GSM network;
All netcom mobile phones support it. With VoLTE telecom service, dual-card dual-standby mobile phones can use two telecom cards. VoLTE has a lot of support, such as Huawei p20, p30, mate20 series, Xiaomi 8 and Xiaomi 9 series.
Telecommunication network belongs to CDMA mode. At present, the mobile phone can not support the dual CDMA network mode, and it must be realized by telecom VoLTE.
Extended data:
VoLTE technical features:
VoLTE is a high-speed wireless communication standard for mobile phones and data terminals.
The most direct experience brought by VoLTE technology to 4G users is shorter on-time waiting time, higher quality and more natural voice and video call effect. VoLTE is essentially different from 2G and 3G voice calls. VoLTE is an end-to-end voice solution based on all IP of 4G network.
Compared with 2G and 3G voice calls, VoLTE can improve the voice quality by about 40% due to the adoption of high-resolution coding and decoding technology. VoLTE brings users a lower access delay (waiting time after dialing), which is about 50% lower than that of 3G, and the time of 2G is about 2 seconds, 6-7 seconds. In addition, in the case of 2G and 3G, there is sometimes a decline, but the decline rate of VoLTE is close to zero.
For operators, deploying VoLTE means opening the road to mobile broadband voice. In the long run, this will bring two values to operators. First, improve wireless spectrum utilization and reduce network cost. Because for voice services, the spectrum utilization efficiency of LTE is far superior to the traditional standard, reaching more than four times that of GSM.
Another value is to enhance the user experience. VoLTE experience is obviously superior to traditional CS voice. First of all, the introduction of high-definition voice and video codecs has significantly improved the communication quality. Secondly, VoLTE's talk time is shortened. Tests show that VoLTE accounts for more than half of CS calls. Thirdly, seamless integration with RCS can bring more services. .
References:
Baidu encyclopedia -VOLTE