Dell Venue Pro - Rebel SIM II suddenly stoppen working

[c4rm1n3]

I'm new here, but anyways.
I used the search in this forum. but could'nt find something that worked.
I tried google as well.

So here my problem:
I got the Dell Venue Pro, but it's locked to T-Mobile.
I bought the Rebel SIM II and without updateing or anything put it in my DVP.
And hurray ! it worked. But one day I changed the SIM + Rebel SIM II holder (the DVP) with another phone ( LG GT 500 ).
and now, the Rebel SIM II isn't working on my DVP anymore.
I tried to apply an new firmware. but that didn't help.
I put the Rebel SIM II in some phones and tried stuff. but that didn't help neither.

I don't want to buy an Rebel SIM II just to make it working again.
So please. help me

[RebelSimCard]

Hi

you need describe better whats not working now

also look on the box and you should always find a firmware number

for dell venue pro thier is no permanent solution for now and the unlock works using the TIMSI in the simcard and for 2g mode is working fine

Rebel simcard