The only answer I can provide is that when you get a new phone it will come with a new SIM. The number will be transferred to your new SIM.
base on this document Prepaid plans the difference between "Simple Choice plans vs Simply Prepaid plans" is that with Simple choice you get less data bucket with international services, while Simply Prepaid you get more data bucket but no international services.
Simple Choice : $50 2gb, with calls and text to or from Canada or Mexico and Unlimited International text messaging
Simply Prepaid : $45 4gb, no international service, so you can only make calls or text in US.
So it really depends on what you need, simple choice is still a good deal because you don't have to pay extra for international services, although with simply prepaid with more data you can call or text using app's like fb messenger through internet.
Well... I'm still on the $50 NA UNL. TT & Data (2GB 4G LTE) plan for the past two years, and it works great, and I've been grateful for such a plan. The music streaming doesn't count against the 2GB data, so nice to be able to use that while in Canada.
However ... things stopped working! Now they charge me $0.10 per SMS to Canada!! They've done something recently that their billing system has started to charge for calls and texts to Canada, so if the prepaid balance is at $0 (zero) - even if you have enabled auto-refill - they block texts and calls to Canada!!
It's so bad that i've had to open trouble tickets 3 times over the last 2 months with absolutely no clue from their technical staff.
Perhaps tmo_lauren has any further ideas why I'm getting charged per text for an unlimited North America plan...
Here's the twitter reply from the tech support:
"This is what came back from our engineers "Our records indicate that the messages for this prepaid subscriber are failing because of "insufficient funds". Please check the customers balance and Verify they have at least $3 on the account to allow messaging and ensure the rate plan includes texting or international texting, if they're trying to text internationally." "
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Assuming I am looking at the right rate plan code based off the description you provided, you should definitely have Mobile Without Borders included which would allow you to have texting to Canada.
I am going to send you a PM, I don't have account access on here but since you have already reached out to the Twitter team, I can get in touch with whoever spoke to you and make sure they understand you SHOULD have it included, and that engineering ticket returned is not providing an actual solution.
Can you please check your PMs here- https://support.t-mobile.com/inbox