Collocations for mobile - adj.

be | become, get
Babies start to get mobile around the age of eight months.

remain

exceptionally, extraordinarily, freely, highly, very | fully
The barbecue is fully mobile.

increasingly | fairly, quite, relatively
She remained fairly mobile despite her disabilities.

geographically, socially
a geographically mobile population

downwardly, upwardly
downwardly mobile members of society

internationally
internationally mobile investment