Deliverability guides

DeliverabilityIntermediateAlphanumeric sender ID support by country: the full tableWhere a sender name is delivered as typed, where it must be registered first and where a number replaces it, for all 228 destinations, generated from the same data as our country pages.9 min readUpdated 21 Sep 2026 DeliverabilityAdvancedGrey routes vs direct routes: how to test what you are buyingWhat a grey route is, the symptoms it produces (fake delivery receipts, replaced senders, late messages), and a handset test protocol you can run against any SMS provider in an afternoon.2 min readUpdated 21 Sep 2026 DeliverabilityIntermediateBulk SMS to Nigeria from abroad: DND, sender ID and priceWhat a foreign sender needs to know about Nigeria: the do-not-disturb registry, sender ID registration with MTN, Airtel, Glo and 9mobile, permitted hours, encoding and the price per message.2 min readUpdated 21 Sep 2026 DeliverabilityIntermediateHow to read sender ID rules before you sendAlphanumeric, numeric, registered: what each rule means for your brand name, why countries differ, and how to plan a campaign that crosses several of them.3 min readUpdated 10 Sep 2026 DeliverabilityIntermediateTwelve reasons an SMS fails, and what the report tells youUnknown numbers, absent subscribers, carrier filters, expired validity: every failure reason in the delivery report, what caused it and what to do next.3 min readUpdated 28 Aug 2026