Newbee on android (Legend)

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In the last 2 days I keep receiving empty massages....from strange numbers...it is not from any available patern phone number...some strange numbers...
I wonder if any have experienced this?
And ...is there free any antivirus/antimalware program that is compatible with legend?

One of the empty messages was from the number 34657355494.
What is that?

I have just factory resetted my legend...hmmmm...the messages seem gone...one of the programs I have installed could be the cause...gotta find out which one...

Hmmm...the message are there again...event without any prgram installed...
The memory card is alreday formatted...factory reset is also done...firmware update is done...
What is wrong with my phone?
If you guys have any ideas...please help me...
Thanks in advance

OK...I have done some research ...and ...have found out....
All the SMSs come from 221...
This happends to several phones under O2 net in Germany..
Caused by the home zone thing which keep sending my coordinates to O2 so that the system knows if my phone is still inside the home zone or not..
So...the SMS is somekind of notification...either failure to connect or simply a bug with the O2 net in Germany
Untill now...none has succeeded...terminating this annoying SMSs...
I have asked O2 service center about this and I have done their advice...
still having those annoying SMSs..
If anyone knows how to terminate or block this SMSs...please tell me.....

In have tried to diactivate CB ...let see if that works..