Open Sans is a friendly font with open letters, that looks just as good on mobile as it does on desktop.

rtdf rtgf retg rth rethg ertwhg wreth ret45h retyhr ethret hreth reth rteh rteh reth reth reth rth reth rethrte 

er ewrg ertg ertg ertgh ertg etrhg erthgre tew rgwer gwer gewr gerwtg ewrtg ewhg erthg ertgh ewrthgetr hg hhwe3

 erg etrg ge ge hgret getrw hgret hgrte hret wh treh reth reth reth retht werh reth treh rh rht rewh rhtre  treh

 erg ewrhg ewthg weth gew hewt hetw hret hetw heth etrh eth eth etrh eth hter erth et eth