If the relationship doesn't survive the smartphone, the relationship probably wouldn't have survived anyway.
Relationships that survive smartphones are able to communicate properly and interact with each other and able to prioritise their life duties etc.
If it wasn't the smartphone or would be some other distraction as the cause of tension. PlayStation, Xbox, sports cars, fishing, going out with the lads, shopping, watching reality television, tinkering in the shed, anything but doing the little bits of relationship maintenance that prevent it from falling apart.