This is my personal experience. VoId is creepy, imho.. Network is not as bad as an year back. Getting 2Mbps (yes, small b) down and 12Mbps Uploads, nowadays. Have been using it (Idea sim) for few days for data around 500 to 800MB per day (thanks to Tubemate). On fourth day, after completing 600MB, my data abruptly stopped working at 10:42PM. Signal is good, I have around 900MB data left. Calls work OK, in 4G. I used airtel for the pending download. Next morning around 9AM and I checked if data is working or not. It's working, smfh. This is the third time happening in this year.
I rarely use this number for calls (tertiary). May be VoId is using tactics to avoid serious regular downloaders. May be treating Idea users as step-child in TN. May be they are doing so in somewhat congested areas like here. May also be coincidence (but for three times??, I really doubt so).
Another reason I hate VoId is, their VoLte calls' clarity is very poor. Even BSNL VoLte is better comparing them. Jio and Airtel VoLte calls are crystal clear, imho. If in any call from my Airtel (main#) or Jio (secondary#) to anyone, the call clarity was poor, I usually ask the other person, "Is your number in Vodafone??". Mostly 99.5% of the time, the answer will be YES, and for the 0.5% times, the answer was BSNL.
So if you going to make many calls, take this into account.