If the smartphone supports 3g, does it necessarily support 3.5g?

Question

Mobile devices

If the smartphone supports 3g, does it necessarily support 3.5g?
Or you need to check by turning on the Internet?
About 4zh and 4.5zh is the same right?

Answer 1

3.6G exactly supports,
but in general there is no such standard, therefore it supports both and does not support