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Unlike RJio4G, RCom4G doesn't have VoLTE support and for Voice-calls & SMS it will be 2G/3G Circuit-Switched-Fall-Back [CSFB]. If RCom 2G/3G Network at your location is pathetic, Pls. Port-out to Network of your choice before 16-Aug-2016. However, you may use RCom4G for Data only! best wishes

Yes, volte is voice over 4g LTE. Yes, volte enabled network is more advanced than other networks which use legacy 2g or 3g network for voice fallback [CSFB]. But since volte technology is still not matured enough, it will consume more battery life for the time being... sent from my Lenovo vibe P1 using Tapatalk

I am try with Three different Band of 4g. Via my mtk engineering mode. Screen shot Below Sent from my F103 Pro using Tapatalk

List of phones supporting Band 3, 5 and 40 from gsmarena website. One plus 3, One Plus X, One Plus 2 Xiaomi Redmi Note 3 Samsung Galaxy A3, A5, A7, J1 Ace, J2, J5, J7, S6, S7, Note 5,Grand Prime, Note 4, On5, On7. Moto G4 Plus, G4, XPlay Lenovo VibeK4 Note, ZukZ2, Zuk Z2Pro, Vibe P1m, Vibe X3, Phab2 Pro Oppo F1, F1 Plus, Neo 7,R9Plus Sony Xperia X, XA, Z3, Z5, M4Aqua, M5, C5 ultra LeEco Le2, LeMax2 Huawei P9, P9 Lite, Mate 8, Nexus 6P,P8 Asus Zenfone 3 ZE 552KL, ZS570KL, ZU680KL, ZC550KL LG G4, G5, Nexus 5X HTC 10, OneM9, One A9,Desire 630 Vivo V3 Max Yu Yunicorn Check for VoLTE capability for complete performance

I bought ZUK Z1 I inserted my cdma sim not supported. after i found model no z1221 is same model selling in china.i figuring out from various blogs and forum flashed chinese firmware on my zuk z1.after flashing now i got cdma working with EVDO.i added the screen shots.but network speed is not good.may due network update. if have any doubt about flashing reply me.