I use "Simple Mobile" which has a $25 a month 1.5GB Data Plan. No contracts.
They also have higher GB (Gigabyte) limits for $30, $35, a month etc.
I use it in together with "Google Voice" which is free Phone Calling (Send or Receive calls) over the internet. Can be used on an android phone, or an iphone.
You need a Free Google Voice number and Google e-mail to do this.
This means you are making FREE calls over the internet (US and Canada) and paying only $25 a month with a data only plan. You can browse the internet, get your e-mails and make calls and text with a data only plan.
That's why I prefer a Data plan over a regular "talk and text" plan.
It is a pretty reliable cellular signal since it is 4G.
A quirky thing about it though, my phone displays a "voicemail" icon (which is not included in a data plan) and I can't get rid of that notification. (But using Google Voice together, you do have free voicemail).