If your business SMS is hitting throughput limits or carrier blocks, you've landed in A2P 10DLC. Honest 2026 map: TCR vetting changes, trust score tiers, the 30007 error, sole proprietor rules, and what your provider actually handles vs what's still your job.
SMS and email are complementary, not competing. SMS wins time-bound urgency and two-way conversation; email wins detailed content and lower per-send cost. We break down the 2026 data, the decision framework, industry-specific channel mixes, and what RCS / Apple Mail Privacy / A2P 10DLC mean for the comparison.
SMS marketing in 2026: A2P 10DLC enforcement is mature, TCPA penalties are climbing, and the carriers actively filter low-quality senders. The 2026 benchmarks, the compliance floor, segmentation that moves numbers, and what's changing with RCS and AI orchestration.