I've been testing out Google Voice + GrooveIP (and Talkatone and sipdroid) to see if I can use TMobile's $30/month data-only plan. I'm concerned that I won't be able to make calls when I'm on a slow data connection. Here's my tests/findings so far:
TEST 1: VOIP over Wifi
Seems to work well. People said they can hear everything I say (and they sound great) but that it's just slightly muffled. Good enough quality that if it was always like this, it's worth the huge savings (but my wifi's very fast). Edit: I've talked to many more people on this and they all hated it. They said I sounded like I was talking through a tin can (and they all thought the other apps were even worse).
TEST 2: VOIP over Hotspot from Sprint Nexus S using 3G
This worked and failed both. The download speed was fast enough (350kbps) that I was able to hear the answering machine I called perfectly. The message played very well. But I was unable to leave a message as the upload speed was too slow (varies between 76kbps and 125kbps). On the answering machine, all you hear is some muffled beeps and scratches.
TEST 3: Talkatone over wifi
It works but the sound is awful. There's a lot of feedback and the voice is unclear as though in an echoing room and talking through a fan. (Done over a 25mbps wifi connection)
TEST 4: Talkatone over Hotspot from Sprint Nexus S using 3G
It worked but not well at all. My voice comes across on the answering machine with slight skipping, and at a slower speed than I actually spoke, and it's very scratchy, but you can (with concentrating) understand it.
TEST 5: SipDroid + PBXes over wifi
Worked OK (not great), but just like with the others when I called someone they told me it sounded muffled and not the best quality. They sounded a little far away (versus GrooveIP, they were 100% clear to me). On the answering machine it was not that clear. Over wifi, GrooveIP is the best quality.
Test 6: SipDroid + PBXes over Hotspot from Sprint Nexus S using 3G
Did not work at first (I could hear the answering machine but it can't get my voice). All I got were clicking noises on the answering machine like penguins. So I forced it to use the speex codec and it finally worked over hotspot! It wasn't very good quality but it was pretty close to Sipdroid over wifi quality.
Test 7: Skype over Wifi
This was easily the winner. The call quality was as good as most home VOIP services. The person i called had really disliked all the previous apps' quality but said this one sounded great. (Skype gives you one free call to a phone per device - not per account, uninstalling won't fix it - so I wasn't able to test it over hotspot. I'll see if I can find another device to try it on)
Obviously, using my Sprint Nexus S as a wifi hotspot is quite a bottleneck, but I know sometimes there will be slow data speeds on TMobile. So I have two questions:
1. What upload speed minimums are typically seen on TMobile?
2. What is the minimum data speed that Google Voice VOIP can work on?
Connection Speeds for the Tests
TEST 1: VOIP over Wifi
Seems to work well. People said they can hear everything I say (and they sound great) but that it's just slightly muffled. Good enough quality that if it was always like this, it's worth the huge savings (but my wifi's very fast). Edit: I've talked to many more people on this and they all hated it. They said I sounded like I was talking through a tin can (and they all thought the other apps were even worse).
TEST 2: VOIP over Hotspot from Sprint Nexus S using 3G
This worked and failed both. The download speed was fast enough (350kbps) that I was able to hear the answering machine I called perfectly. The message played very well. But I was unable to leave a message as the upload speed was too slow (varies between 76kbps and 125kbps). On the answering machine, all you hear is some muffled beeps and scratches.
TEST 3: Talkatone over wifi
It works but the sound is awful. There's a lot of feedback and the voice is unclear as though in an echoing room and talking through a fan. (Done over a 25mbps wifi connection)
TEST 4: Talkatone over Hotspot from Sprint Nexus S using 3G
It worked but not well at all. My voice comes across on the answering machine with slight skipping, and at a slower speed than I actually spoke, and it's very scratchy, but you can (with concentrating) understand it.
TEST 5: SipDroid + PBXes over wifi
Worked OK (not great), but just like with the others when I called someone they told me it sounded muffled and not the best quality. They sounded a little far away (versus GrooveIP, they were 100% clear to me). On the answering machine it was not that clear. Over wifi, GrooveIP is the best quality.
Test 6: SipDroid + PBXes over Hotspot from Sprint Nexus S using 3G
Did not work at first (I could hear the answering machine but it can't get my voice). All I got were clicking noises on the answering machine like penguins. So I forced it to use the speex codec and it finally worked over hotspot! It wasn't very good quality but it was pretty close to Sipdroid over wifi quality.
Test 7: Skype over Wifi
This was easily the winner. The call quality was as good as most home VOIP services. The person i called had really disliked all the previous apps' quality but said this one sounded great. (Skype gives you one free call to a phone per device - not per account, uninstalling won't fix it - so I wasn't able to test it over hotspot. I'll see if I can find another device to try it on)
Obviously, using my Sprint Nexus S as a wifi hotspot is quite a bottleneck, but I know sometimes there will be slow data speeds on TMobile. So I have two questions:
1. What upload speed minimums are typically seen on TMobile?
2. What is the minimum data speed that Google Voice VOIP can work on?
Connection Speeds for the Tests
- Wifi Down: 23-25mbps
- Wifi Up: 3-5mbps
- 3G Hotspot Down: 300-450kbps
- 3G Hotspot Up: 76-125kbps
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