Telna Again?

[Bossman]

Voicemail is not functional on their sim card. Somewhere in this thread, the telna representative that posts here mentioned they are working on it.

Originally Posted by biophysics

Hi,

looking for help in setting up voicemail. Using iphone 2g.

activated voicemail on telna website, turned phone off and on again. still nothing. I tried dialing my own number, but the call hangs up. any help is appreciated. thanks

[Bossman]

Incoming calls have not been possible on my sim since Friday. Caller just gets a tone than the message that the call cannot be completed as dialed. I am seriously beginning to question the reliability of Telna. One day last week I received an email that detailed some kind of major outage that they suffered, that took down their entire system. I am not sure if this is related to that.

I travel out of the country for 2 weeks on Wednesday. My plan was to forward my US number to my Ekit and/or Telna, since it's important that I am reachable. Telna just made that decision easy.

[DRNewcomb]

If I had to pick one issue that I thought was the most serious for Telna, I'd have to say it's reliability. There have been times when it was difficult to get the SIM even to register on T-Mobile. I doubt I would travel with TelnaMobile without also having a backup plan. Of course, that's true of any roaming solution. Spare phone, spare unactivated SIM, backup service, etc.

[Bossman]

I am currently in Nigeria. Using a local MTN sim and Ekit. I am not surprised any bit that my telna did not register on any network and is now showing unregistered sim. Even though it was working find before I left the US.

[DRNewcomb]

Originally Posted by Bossman

I am currently in Nigeria. Using a local MTN sim and Ekit. I am not surprised any bit that my telna did not register on any network and is now showing unregistered sim. Even though it was working find before I left the US.

Sometimes it takes several power-cycles and a wait before it will register. I think it has something to do with the multi-IMSI SIM they use.

[Bossman]

Absolutely! Thanks for mentioning this. I power cycled and a few minutes after powering up, it registered, and calls were possible.

Originally Posted by DRNewcomb

Sometimes it takes several power-cycles and a wait before it will register. I think it has something to do with the multi-IMSI SIM they use.

[LBarouf]

Originally Posted by DRNewcomb

Sometimes it takes several power-cycles and a wait before it will register. I think it has something to do with the multi-IMSI SIM they use.

Do you know to which networks the IMSIs are tied to? How do you control on the SIM which IMSI to send to the VPLMN and how can each IMSIs be used by the same MSISDN. Wouldn't the HLR return an error? I thought 1 MSISDN=1 IMSI. Unless each MVNO agreement is tied to a different HLR but CDRs are consolidated per MSISDN for billing.

[DRNewcomb]

Originally Posted by LBarouf

Do you know to which networks the IMSIs are tied to? How do you control on the SIM which IMSI to send to the VPLMN and how can each IMSIs be used by the same MSISDN. Wouldn't the HLR return an error? I thought 1 MSISDN=1 IMSI. Unless each MVNO agreement is tied to a different HLR but CDRs are consolidated per MSISDN for billing.

Once long ago I read the details of how multi-IMSI SIMs work. I've forgotten the details. However, I know that at some point the phone tells the SIM the MNN of the network it is attempting to register on. The multi-IMSI SIM can change its personality based on this information. There is really no way for the user to get the SIM to change its behavior. It all has to do with the networks the phone sees when trying to register.