No idea and I have no way to check...only thing I know is that into 1.48 in order to have the incall associated with contact you have to set all contacts number with international prefix...maybe ZTE also changed something related to international sms...I suggest you to make nandroid backup via cwm and then install the stock 1.48 in order to see if it works... also you could try my 1.41 Repack just to see if with previous release it is ok....
Inviato dal mio NX505J usando Androidiani App