Can I send and receive text messages after my mobile phone is turned on?

Mobile phone HD can't be turned on, depending on personal needs. After opening, the screen display effect is good, but it will increase energy consumption and the response speed of the mobile phone will decrease. But turning it off has obvious disadvantages: the traffic will be cut off when you make a call, and you can't enjoy good sound quality compared with a high-definition mobile phone.

VoLTE (VoiceoverLTE) is a voice service based on IMS. It is an IP data transmission technology, which does not need 2G/3G network, and all services are carried on 4G network, which can realize the unification of data and voice services under the same network. In other words, 4G networks not only provide high-speed data services, but also provide high-quality audio and video calls, all of which require VoLTE technology. IMS supports multiple access and rich multimedia services, and has become the core network standard architecture in the all-IP era. After several years of development and maturity, IMS has now crossed the rift valley and become the mainstream choice for the transformation of VoBB and PSTN networks in the fixed voice field, and has also been determined as the standard architecture of mobile voice by 3GPP and GSMA.

The most direct feeling brought by VoLTE technology to 4G users is shorter connection 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 in 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 50% lower than that of 3G, about 2 seconds, compared with 6-7 seconds in the 2G era. In addition, under 2G and 3G, dropped calls sometimes occur, but the dropped call rate of VoLTE is close to zero.