Is Mobile Share Plus 3GB limited to 3mbps too?

You might want to update your plan, that must be very old.  

 https://www.att.com/prepaid/plans.html

The current $40 ($50 - $10 auto pay) is 8 gigs full speed data.   

The question is what prepaid plan do you have? I forget when the 3 mbps was dropped but it may have been since June. That restriction was only on the prepaid unlimited data plan. Now there are 2 different prepaid unlimited data plans and no prepaid plan has a 3 mbps speed restriction.

The current plans I listed have changed only slightly since June.  In June, there was a 3 gig plan, but it was full speed data, not throttled.  

The only prepaid plan offered in the past 4 years and throttled at 3g speed, is the prepaid unlimited Choice plan.  

@lizdance40 The plan named Unlimited Choice was postpaid, not prepaid. Prepaid only had one unlimited plan prior to the introduction of the $85 plan. It was not called “choice”.

I stand corrected, it was similar to the unlimited choice postpaid

Did some more testing, looks like my APN settings were slightly off. Speed test was hitting 3mbps for 5 tests in a row, but now it's back to 15mb on 3g and nearly 30mb on 4g!