iPhone 7 Plus - Speed drop while on VoLTE call

Discussion in 'iPhone' started by Morac, Oct 18, 2016.

  1. Morac macrumors 65816

    Morac

    Joined:
    Dec 30, 2009
    #1
    I decided to run a speed test while on a VoLTE call with AT&T. I know it was VoLTE because the LTE symbol remained during the call.

    Anyway, I used the Ookla Speedtest before, during and after the call to the same server. The results were as follows:

    Before ping 43 ms, 60.30 Mbps down, 21.42 Mbps up.
    During ping 59 ms, 36.66 Mbps down, 10.63 Mbps up.
    After ping 38 ms, 60.32 Mbps down, 16.12 Mbps up.

    As you can see during the call, the ping increased, download speeds dropped by about 40% and uploads drop by around half.

    If the phone didn't say LTE and the Speedtest didn't report LTE, I would think it dropped to HSPDA+.

    Is this normal?
     
  2. tekjunkie macrumors 6502

    Joined:
    Oct 25, 2013
    #2
    That's too fast for HSPA these days. Idk why that happened but could be a requirement as the VoLTE call would need priority. I see nothing wrong here though.
     
  3. willmtaylor macrumors G3

    willmtaylor

    Joined:
    Oct 31, 2009
    Location:
    A Natural State
    #3
    I could be missing something, but VOLTE means you're using your data connection for a voice call, no? So your bandwidth is being used by the call, no? So it would be normal to see a drop in speeds, wouldn't it?
     
  4. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #4
    Yes, pretty much.
    It's like doing a Speedtest while listening to pandora.
    There's something in the back using data and that's the volte call.
     
  5. Morac, Oct 19, 2016
    Last edited: Oct 19, 2016

    Morac thread starter macrumors 65816

    Morac

    Joined:
    Dec 30, 2009
    #5
    I would expect a minuscule drop in speed. There's no way a voice call uses 20 Mbps worth of data. It would use a few Kbps at most.

    On a side note, I've seen HSPA+ speeds in at least the 20 Mbps range before. I'm not sure if I've ever seen over 30 Mbps though.
     
  6. Mlrollin91 macrumors G4

    Mlrollin91

    Joined:
    Nov 20, 2008
    Location:
    Ventura County
    #6
    Its throttled. AT&T has been throttling data while on a call now for years. It got to the point where when you were on 4G, you would get no more than 1Mbps while on a call.
     
  7. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #7
    Yes, I remember that.
    I don't see the reason behind it but when I did a Speedtest while on call the speed was around 1mbps.
    Either way 36mbps is still great. I wouldn't worry about it if I was the op.
     
  8. AutoUnion39 macrumors 601

    AutoUnion39

    Joined:
    Jun 21, 2010
    #8
    Yes, this is the same on any carrier with VoLTE. The QoS in place gives priority to voice traffic and data takes a back-seat.
     

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