MDA Compact IV: MyFaves registration SMS

[Top_S]

Dear developers and experienced people,

I have got a problem with the T-Mobile MDA Compact IV. When switched on, the phone always tries to send a registration SMS to the number 72059. With a non-T-Mobile SIM this results in an error status message. I don't know, whether this SMS attempt costs me money.

Is there any possibility (via registry etc.) to prevent the phone from sending this SMS WITHOUT flashing a new, unbranded ROM?
I wonder if noone else has noticed this already...

Thank you!

[Addicteddddd]

I havent' had this at all and i have an MDA C4, is this with a new ROM install or anything?

[Top_S]

I havent' had this at all and i have an MDA C4, is this with a new ROM install or anything?

I just tested with a non German SIM, I don't get the error with that. I guess the error (short number not available) is an O2-specific error message, other providers don't react at all. But I guess the phone nevertheless attempts to call/message this T-Mobile internal number.

Edit: no new ROM, MDA just out of the box.

Maybe the phone does not try to send an SMS to the MyFaves number, but it is some kind of SIM Toolkit function?
Perhaps this behaviour would stop if I let it connect once with a T-Mobile SIM?

[Top_S]

I have news again about this topic. The number this message is sent to can be found in the registry key

[HKEY_LOCAL_MACHINE\Software\HTC\My5\SMSC]
"SendNumber"="72059"

If I change this number to an empty value or if I delete the whole My5 tree from the registry, I don't get these errors anymore. Nevertheless I don't know whether for example in roaming I am billed for SMS attempts to an empty number.
Could anyone find out whether MyFaves fully stops sending messages if these keys are deleted or if it only sends messages to empty numbers in this case?

[Top_S]

I did a lot of testing during the last few days. My results were kind of disturbing:

When in a home network, the MDA sends a silent SMS to the MyFaves number. Of course this number does not exist in most networks, but you also do not get an error message about it.
But when used in roaming, these SMS are charged. So everytime you switch on your mobile phone, you are charged a SMS from the foreign roaming network, even if the message has no valid target.
The registry key with the number can be changed, so I changed it to my own number. The resulting SMS did not show any meaningful plain text, but some binary looking glyphs instead. Since the message has got oversize, I was actually charged for 2 SMS!
The only way to circumvent this behaviour is to delete (or rename) the My5 tree from the registry. When switched on, the phone adds the tree again, but with empty values. Since there is no number to send to, the SMS is suppressed and does not cost any money in roaming.

Conclusion:
This is not a good behaviour for a SIM lock free phone. If someone does not know this, he/she has a bill of about 15 Euro/month just for switching the phone on every day. Since the phone does this quietly, most people would complain with their provider rather than finding the phone guilty.