Players also have the option to phone boss characters themselves and request a mission (by selecting ' Request Job' on their phone), shortly after which they will receive a text message offering one of that character's missions. These messages are sent periodically to the player, and may offer either new missions or previously completed assignments (but tend to weigh towards the former should any new, uncompleted jobs be available). Missions are offered to the player in the form of a text message sent by one of the NPC boss characters. Higher-ranked missions tend to be more difficult, take longer and offer greater money ($) and reputation point (RP) rewards. Missions are unlocked as the player ranks up in GTA Online - to start with, few will be available, but this number will increase with rank.
