data recovery; recover text messages

Hi, we have a client who purposely deleted text messages off their iPhone.  Not sure if an icloud account exists to attempt recovery---that is being verified.  incase icloud wasn't on-------need to recover text messages very soon.  

We sent it to one of the data recovery experts but they were only able to recover 4 text messages out of atleast a couple dozen that we were expecting to recover.      

I understand that Iphones are especially harder to recover from and some data recovery experts may not be as proficient in recovering iphones as they are with data on regular ide or sata drives.      so----asking to see if anyone has worked with the best of the best professionals out there that specialize in recovering deleted data (text messages) off iphones?     Exploring this to the fullest before settling; help is much appreciated.
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Justin BradshawOwnerCommented:
I'd say your best (and maybe only) bet is that the client who may have an old iPhone backup that includes the messages. Then you could restore from that backup and have them all. Otherwise the chances are slim, I'd say.
You need a forensic recovery product.   check this one out ..

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