I've been using an unlocked 9900 for the past couple weeks on SFR. I've never seen H+ (HSPA+) though, and "Network mode" under Mobile Network settings only shows "3G & 2G" and not "3G/H+ & 2G" like some have seen on networks that support H+. SFR supposedly supports HSPA+ on UMTS 900 in large cities.
So I'm curious, when you get your SFR 9900:
Could you check the model number? It's under the battery. Mine is RDV71UW.
Do you see H+ rather than 3G?
Do you see a "3G/H+ & 2G" in your Mobile Network settings?