Why is my straight talk iPhone data so slow?

I have a jail broken iPhone 4s which I use with straight talk. When I first got it I downloaded a program on safari and the 4g and mms worked perfectly and I could watch Netflix. But I reset it and and this time I could not find the program I downloaded last time, so I used tetherme and now my Internet is so slow, but it still says I have 4g

Iofhiorehgiorhioiog just wanted my 2 points

  • Why won't 3g work on my Straight Talk iPhone? Text, calls, and Wi-Fi work fine but 3g won't work. I was told my phone runs off of Verizon towers.
  • Why can't i send photos mms texts with my iphone 4 with straight talk as my carrier? Is there any setting i need to change or something specific i need to do to allow the photos to go through text messages the last couple of times i tried, it attempts but says there's an error. I have straight talk as my carrier. Can anyone help
  • What's the data limit for Straight Talk's Unlimited plan? I'm probably going to buy the unlocked GSM iPhone 5 and then use it on Straight Talk. However, has Straight Talk said how much data you can use before your data speeds start getting throttled? Also, will the data that I use while I'm on Wi-Fi count against that data limit?
  • What are Straight Talk's data speeds? I have bought an unlocked iPhone 5, and I was about to buy the Straight Talk sim, but then I realized that I didn't know their data speeds. I was surprised to learn that NOWHERE do they post their data speeds. I emailed them a week ago, and because of the half-baked customer service, they haven't replied. Anyway, does anyone know what their data speeds are, or at least have experience with them?