Using multiple USB GSM/3G 'dongle' modems on one computer often does not work reliably. These modems are not designed to install more than one of them on a computer, sometimes it works great but in other cases the modems interfere with each other and are causing problems.
In general, dongle style modems like the ZTE MF190 are a bit 'hit or miss'. Modems that work well on one computer and mobile network can work unreliably on a computer with another version of Windows or on another mobile network.
If you are a licensed user of Diafaan SMS Server you can send a communication log for one of the modems to firstname.lastname@example.org and I will have a look to see if I can find anything unusual. But usually there is not much you can do when the modems behave erratically.
I have several modems zte mf190 so that when they are working they disconnects and not around and sometimes they disconnects and connects all the time .. what to do to use modems
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