I took apart an old Huawei 3G wifi modem, hoping to leave the radio stuff, and find an off the shelf MCU in there.
Aside from an Atheros wifi chip, and a Hynix memory chip, the only other ones not to do with RF are:
Hi 6755RBC / 120 / HP0221122
Hi 6331RBC / 381 / CP0051127
However, I can find nothing about them. Can't even establish which company this is.
The modem exposes an admin web page, so I'm sure one of those must be doing the business!