I have a iPhone 5 on a grandfathered unlimited data plan. Don't want to jail break it, looking at buying a ATT MyFi Liberate hot spot. The iPhone 5 as a micro SIM, wondering if I get a SIM adaptor to full size, then plugged the iPhone 5 SIM into the liberate would it work.
I hardily use voice, normally lest than 15 minutes a month, but I get a lot of corporate email so would like to bounce between my iPhone,iPad and laptop.
Your iPhone 5 actually has a Nano SIM, which is a bit smaller than a Micro SIM, so keep that in mind.
I do not believe you would be able to use your MiFi on your grandfathered unlimited data plan. On the network, you are in an LTE-capable iPhone data plan. The MiFi would more than likely require a hotspot only data option for it to successfully connect to the network, and there isn't an unlimited option for dedicated hotspot devices.
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AT&T is also speed limiting data on unlimited plans to 3G per month or 5G on LTE networks. Also make sure you read your contract if an I divi dual account can be used for business without changing to a new rate plan