Which MVNOs support visual voicemail?

Thanks, but you apparently didn't notice that that is the very support article that I cited in my question. If the carrier is in the list and Visual Voicemail is not checked, then we know they don't offer it. If a carrier is not in that list, how can you assume the answer is no? There are at least 18 carriers not on that list, and that's just the ones that use the AT&T network.

Interesting to see that that Apple article has been updated. Straight Talk is now showing as SUPPORTING visual voicemail. However, I still don't have it, and the support people on the ST forums are apparently still telling people it is not supported.

KiltedTim wrote:

StraightTalk only supports that feature on CDMA iPhones made for StraightTalk. They do not support or allow using unlocked GSM iPhones on ther service at all.

I'm not sure about the first part, but the second sentence doesn't seem to be correct. I myself have an unlocked GSM phone that I brought with me to Straight Talk and it works fine, except for visual voicemail.

As far as GSM, Straight Talk has access to both the T-Mobile and AT&T networks. When you sign up for Straight Talk and are bringing your own phone, you can either get a T-mobile-compatible SIM or an AT&T-compatible SIM. I have the latter.

Well, you seem very adamant, but what you're saying doesn't match my experience. "Using an unlocked GSM iPhone on Straight Talk is not supported." By whom? Straight Talk does indeed advertise and say that unlocked GSM T-Mobile- and AT&T-compatible phones are compatible with their service. You can go here (http://stbyop.com/straighttalk/) and enter your iPhone's IMEI and zip code and see if Straight Talk thinks it is compatible with their network. You can also read their FAQs where they talk about compatibility (http://www.straighttalkbyop.com/faq.php).

And I didn't have to jump through any hoops. I have talk, cell data (3G on my iPhone 4), mms, and voicemail. Just not visual voicemail. And I have read, but cannot claim first-hand, that when you buy a ST iPhone 5S or 5C, it is a GSM phone running on AT&T network.