You can switch over to the $30 plan you’re mentioning even if already have a plan with T-Mobile, and keep your number. Here is what I did (originally I had a $60/mo prepaid plan):
1) Buy a T-Mobile SIM (or “activation kit”) online for $1
2) When the SIM arrives, go online to t-mobile.com and activate it with the $30 100min/unlim/5GB prepaid plan. You’ll get a new T-Mobile number.
3) Call T-Mo customer service and ask them to transfer the phone number you have with your $60/mo plan to your $30/mo plan (you’ll need to give them both numbers and possibly SIM #s). Also ask them to cancel your $60 plan once the transfer is complete.
4) Wait a little… usually no more than 24 hrs, typically it takes much less. You should get a text notification on your $30/mo SIM/phone that your new service is activated, mentioning your old number.
“Right now, Google will never admit to this reality. To be honest, I’m not sure most people on the Android team even realize this reality. But at the end of the day, this comes down to making money. Microsoft is currently making more money off of Android than Google is. iOS is providing more mobile revenue when it comes to Google searches. The model is already broken and it runs the risk of cracking wide open unless there’s a product that can keep it together.”