Table 2.

Schedule of activities

Phase	Time point	Target timing	Key activity	Key information collected
A	tA	Enrolment	Baseline survey	HIV testing preferences, history, HIV risk, sociodemographics
	tAfu = tB*	tA + 91 days	Phone-based FU	HIV testing uptake since tA
B	tBs	tB + 28 days	SMS reminder
	tBfu	tB + 91 days	Phone-based FU	HIV testing uptake since tB
C†	tBx = tC	tBfu + <91 days	Testing invitation (‘common’ option)
	tCs	tC + 28 days	SMS reminder
	tCfu	tC + 91 days	Card collection from testing sites, phone-based FU	HIV testing uptake since tC
D†	tCx = tD	tCfu + <91 days	Four testing invitations, study arm specific
	tDs	tD + 28 days	SMS reminder
	tDfu	tD + 91 days	Card collection from testing sites, phone-based FU	HIV testing uptake since tD
E	tE	tDfu + <91 days	Phone call and SMS message with incentive offer
	tEs	tE + 28 days	SMS reminder
	tEfu	tE + 91 days	Card collection from testing sites, phone-based FU	Choice among testing options offered, HIV testing uptake since tE

*The phone-based follow-up at the end of Phase A constitutes the beginning of Phase B.

†To reduce variability across participants in the timing of Phase D, some participants will be enrolled directly into Phases C and D.

FU, follow-up; SMS, short messaging system.