As we All know 4G jio sim card available which having trouble in 3G smart phones because of VoLTE technology, so Use 4G jio on 3G Phone VoLTE Guide which easily explain to convert LTE device supportive system to VoLTE systems.
3G phone user also get experience of 4G internet speed with it.
here is the many different ways to make system properly supportive with 3G to 4G speed.
it will be useful for 3G phone users
Note :
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Bug Fixed
9Apps 4.9
