I just did a search here to update my response... wherever I posted my experience with Tmobile and my mobile hotspot...
They only offer 2g per month for a mobile hotspot.. Phone tethering is limited to 10g...
I've been searching their website, calling customer service, and trying to find the best way to get uninterrupted service...
Today, I went into the Tmobile store. I've been using Tmobile for a few years and really like having them.
I have the $70 All-In plan.. or One plan.. whatever... My bill is $70 per month unlimited everything, but just that 10 gigs for wifi/tethering for my laptop..
So I was gonna add a new phone.. I went in to Tmobile today.. and it turns out that for $25 more per month I can get unlimited wifi-hotspot using my current phone, or tethering via USB (this is faster sometimes). So that's what I went with... so as of this afternoon, I now pay $95 per month, unlimited everything calls, texts, internet, and now wifi/tether with my current phone also.
I've been watching movies on the Macbook, while also surfing the web on the PC laptop all afternoon and service is great. No lags, spins or anything...
$95 certainly isn't the cheapest around.. but I really like Tmobile, am happy with their service, and the perks that come with doing business with them such as the Tmobile Tuesday Freebies.