after changing batery charmy dead

[kundt]

Hi everone, i have a big problem. I changed the SIM card in ma MDA compact 2 for a while, and then a gave my T-mobile sim card that i used usually and turned on the device. On the PIN code sreen it wrotes "INVALID SIM CARD"

what is the problem? i tried HR, new ROM. The sim is OK.

Please heeeeeeeeelp :confused:

[nocturne.op.15]

this is realy strange. i see few possibilities:

1) sim card damaged by static electricity - the best case. Try another sim, if ok, tmobile will replace your sim for a small fee with the same number

2) damaged software inside device. this could also be repairable. try to flash latest official t-mobile rom, complete update with radio especially. imho german aku 3.3 is the latest

3) damaged hardware - hope this will not happen.
the best case wil be damaged sim card holder - this can be bought in every electricians shop, this is also the only part you can replace yourself (unless you are really well skilled electrotechnician)
otherwise, if circuits are damaged, just t-mobile or htc service is the possibility.

Try following step-by-step:

1) clean sim contacts with hard rubber, then clean with ethanol
2) check the sim card holder if pins are not bend or damaged. clean them with cotton and ethanol
3) check also board visible around sim card holder for scratches
4) discharge it completely, as much as possible
5) charge again to 100% (sometimes discharge-charge cycle helps with such strange cases)
6) flash latest tmobile branded rom

I have no further ideas except tmobile or htc service...

[kundt]

the holder is good because the O2 card is going in the MDA, only the T-mobile card wont start. And the T-mobile card is good a placed it into a K750 and it goes...

[nocturne.op.15]

that's good, does not look to be hardware malfunction.

what about another tmobile sim?

isn't possible that you have accidentally sim-locked your device during some experiments? it will be good to try possible unlocking schemes (in fact, i'm not experienced in those lock things, others are...)

[kundt]

an another sim makes the same as my, INVALID SIM CARD. i think its locked on T-mobile :( what to do?

[nocturne.op.15]

as i said, i'm not experienced with this. you may try this:

http://forum.xda-developers.com/showthread.php?t=250520

[kundt]

im happy, it goes, i gave a little piece of paper under the battery, and its good :P

[nocturne.op.15]

:-D
nice. try to clean sim holder contacts and pull them a little bit upwards.