The US has number portability - you should be able to switch now and keep your number
However having said that, I'm not sure it will keep working if the original provider goes bust. If it's the same as in the UK, under the hood the implementation requires the original owner of the number range to do forwarding. So it's worth checking if the owner of the range of numbers containing your number - often a different company - is on the list
However having said that, I'm not sure it will keep working if the original provider goes bust. If it's the same as in the UK, under the hood the implementation requires the original owner of the number range to do forwarding. So it's worth checking if the owner of the range of numbers containing your number - often a different company - is on the list
(Edited to add) Actually it looks like the US has a centralised implementation: https://10xpeople.com/blog/switching-carriers-and-retaining-...