[Q] No 3G for a S5830M in France - Galaxy Ace S5830i Q&A, Help & Troubleshooting

Hello all,
I have a S5830M which was bought in the USA. I can't use its 3G in France but the Edge is working.
The things I tried :
- Changing its kernel/ROM/baseband (it presently runs Simplicity V1 with the S5830iXXLH2 baseband). It has been of no use so far.
- Changing its antenna. I replaced the original one with the antenna of a S5830 bought in France (3G worked with it when it was operational). It improved the situation slightly : I had the choice between WCDMA (=3G) and Edge in the phone settings. But when I chose WCDMA, it made me unable to even make a phone call.
Is there anything I can do to activate the 3G on this phone ?
Thank you in advance for any help you can provide :good:

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