Koko Mobile / Naka

[GadgetKen]

Still using my Koko Mobile sim card as a secondary sim in a rugged phone. In the USA, it will work on AT&T (my primary sim card is using a T-Mobile reseller called Mint)...no need to constantly top up the Koko card like a domestic prepaid AT&T MVNO.
It works fine when I am in Bermuda by USSD dialing. Other mobile alternative there were VOIP using a SkyRoam mifi device.
My primary need for Koko is really a backup sim that can use AT&T in the USA but also can roam in countries my primary sim doesn't work in (like Bermuda).
Also my interest in Koko is really for voice and SMS text messaging, since I can get data cheaper domestically or internationally through other means.
Like the switchable profiles and the USSD dialing capability.

My main reason for picking up a Koko sim card was the Piranha debacle...couldn't wait for Piranha to switch from Telna to Jersey Telecom as a background provider. The 2 Piranaha cards were eventually replaced, and now are used in emergency phones for my elderly parents.

[GadgetKen]

Having problems with my Koko card.
Can't register sim on AT&T USA other than emergency calling. Also having trouble switching the country profile setting. Tried in two unlocked phones. Filed a trouble ticket and will see if they respond and fix the issue.
Not a JT issue because I swapped the Koko for a Piranha sim chip in my smartphone and Piranha works fine on AT&T.
Also noted that AT&T USA prices are up for Koko but down for Piranha.
Piranaha was USD$.10/minute and is now USD$.06/minute.
Koko was CHF.09/minute and is now CHF.13/minute (CHF and USD are almost on par).
Even if Koko fixes the problem I will likely switch back to Piranha because their prices are currently better in the countries where I need it most.

[bourbonkiller]

Sorry to hear your problems @gadgetken. I've been in China last week of August with Koko Mobile and had no problems with Network. Automatic Network search as well as Sim Kit Profile change worked like a charm, even had 4G Data in China. Only hassle was, that incoming calls were not 100% stable. I believe this is because the SIM card didn't manage the change between 4G and 3G properly. Beside that, the Simard performed rock solid and Data worked like a charm all week long. Even WhatsApp Calls and VoIP Calls through Data worked perfectly.

Initially, the SIM card only registered on EDGE Network, wrote a Email to them and got a answer within hours...