Numbers on top of keyboard permanently
How can I show the numbers row on the top of iPhone XS Max keyboard permanently?
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This is a feature which is only on iPads, not on iPhones unfortunately. You can, however, install third-party keyboards which have this feature. A quick Google search will give you a list of third party keyboards with numbers on the top row.
See About the keyboards settings on your iPhone, iPad and iPod touch – Apple Support for more information on keyboard settings of your iOS device.