iOS Robocall Blocking

Here are 15 of the top apps available for iOS devices, based on publicly available data, which may include user ratings, number of downloads and/or most recent version date. For a full list of robocall resources for iOS devices, see here.

AT&T Call ProtectFreeAutomatic fraud blocking, manual call blocking, report spam calls, suspected spam warning 
Call Guardian (Cequint Inc.)14-day free trial, $3,99/month afterReal-time spam protection, block unwanted calls, get spam risk assessment 
Hiya Caller ID and BlockFreeAuto spam detection, reverse phone lookup, spam-check dialer, blacklist #, report spam
Mr. Number: Spam Protection & Number SearchFreeBlocks calls from numbers associated with known scams or fraud, numbers belonging to telemarketers, solicitors, and bill collectors, and specific numbers on your blacklist 
Nomorobo14-day free trial, $1.99/month or $19.99/year afterVoice robocalls and SMS text message spam/phishing protection
Numbo - Call Protect & Blocker (Master App Solutions)FreeBlock unwanted calls, blacklist, use blocking database, back-up blacklist 
PhoneGuard - Call Spam and Scam Blocker (BergTech, LLC)$0.99Blacklist, whitelist
PrivacyStarFreeBlock any number, lookup any number and report any number
RoboKiller - Stop Spam Calls (TelTech Systems)FreeBlacklist, play back blocked calls, spam list automatically updates 
Sync.MEFree, in-app purchasesCaller ID, identify unknown callers, block spam callers, number search
T-MobileIn-Network SolutionBlock all known scammers
TrapCall: Always Know Who's CallingFreeBlocks unknown and unwanted calls
Truecaller: Number Search & BlockFreeBlacklist, top spammers list
Verizon Caller Name ID10-day free trial, $2.99/month afterAvoid unwanted callers with real-time spam detection, add unsolicited callers to personal spam list, block unwanted callers, get caller name ID on incoming call screen
YouMailFreeBlocks & blacklist unwanted caller, sends directly to voicemail w/o ringing, up-to-date report of top spamming # in US

Watch for step-by-step instructions to block robocalls on iOS (Apple) devices.