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I would absolutely pay for this feature and it will be enough of differentiator for me to pick specific phone model. I live close to major metro area and I do not have cell connection on a regular basis starting from ski resort with spotty connection (does not work at all on some runs) to walk (not even hike) in the closest state park. Ability to use Messenger withtout cell is easily $200-300 feature I would pay for.

On antenna - you can probably build purpose-specific satellites for text messaging that does not require big antenna. Iridium is 485miles high orbit - you can probably have satellites at closer to 150-200 miles elevation