# MobileB > MobileB (mobileb.net) is a workspace for WhatsApp built for people, teams and AI agents. > It joins each WhatsApp number as a linked device, the same mechanism WhatsApp Web uses, > runs the session on MobileB's managed servers, installs nothing on phones, and is not > affiliated with WhatsApp or Meta. Version 0.9.0-beta.1, beta channel. Everything is free during the beta. Key facts: - Up to 10 WhatsApp numbers in one unified inbox, on every device you sign in on. - The record keeps messages sent from the phone, keeps deleted messages labeled, keeps edit history; read receipts can be paused per conversation (silent reading). History is kept until the account is deleted. - Shares by email to another MobileB user: one conversation, a category, a number or everything; view only or can reply; 7 or 30 days or none; pending until accepted; revocable by both sides; audited (invited, accepted, declined, revoked, left, permission changed, replied) with time, IP and device; delegated messages read "X on behalf of Y". - AI agents over MCP at https://app.mobileb.net/mcp (Streamable HTTP; OAuth 2.1 with PKCE and dynamic registration, or a personal bearer token). 42 tools live: 24 read, 16 act, 2 share, including on-server transcription of voice notes and video audio. A consent screen scopes numbers, conversation categories, read or send, and expiry; the client never sees the answers. Every request is logged for 90 days as references, never copies. Agents can never set tags, read shares granted to the owner, or widen their scope. Creating conversation shares is a separate consent switch, off every time the screen loads, shown only when the client asked for mcp:share, and unavailable unless send is granted. Every agent message is attributed by name. - Connecting: Authorization: Bearer mba_ from Settings, AI agents, or OAuth. An unauthenticated call answers 401 with WWW-Authenticate pointing at https://app.mobileb.net/.well-known/oauth-protected-resource. Scopes: mcp:read, mcp:send, mcp:share, offline_access. One JSON-RPC 2.0 object per POST (a top-level array is not a batch and is rejected), GET and DELETE answer 405, no session ids: any request may be the first. Call list_accounts first, because every other tool takes an account_id from it. Limits: 240 requests per minute per address, plus per-token per-minute budgets (240 standard, 12 media, 6 video, 12 transcription, 2 sync); over either, HTTP 429. - Advanced security: an optional second end-to-end layer between two MobileB users; keys only on their devices; encryption from acceptance; safety numbers for verification; files sealed with their names inside; erase after reading; the server holds no key. It hides content, not the fact of a conversation. - Security: no third-party scripts, fonts or analytics in the app or on the site; the linked-device session runs on MobileB's managed servers, so WhatsApp sees those servers' address for that device rather than the user's (the phone still talks to WhatsApp directly); kill switch in WhatsApp's Linked devices; media outside the web root; least-privilege database role; 267 web tests and the full API suite against a real PostgreSQL on every push. Not yet: MFA on the MobileB login, a devices list, certifications, a DPA, an active off-host backup schedule. - Tiers: beta now (10 numbers, agents may send, 100 shares), free for everyone. Two paid tiers follow it and neither is purchasable yet: Advanced (5 numbers, 3 agent tokens, agents read but do not send, 25 shares) and Enterprise (10 numbers, 10 tokens, agents may send, 100 shares). No prices are set. Internally the entitlement rows are named pro and enterprise. Pages: - Home https://mobileb.net/ - AI agents https://mobileb.net/ai · Connect https://mobileb.net/ai/connect · Tool reference https://mobileb.net/ai/tools (JSON: https://mobileb.net/ai/tools.json) - Agent manual https://mobileb.net/docs/agent-manual (full text: https://mobileb.net/llms-full.txt) - Enterprise https://mobileb.net/enterprise · Pricing https://mobileb.net/pricing · Limits https://mobileb.net/docs/limits - Security https://mobileb.net/security · Privacy https://mobileb.net/privacy · Terms https://mobileb.net/terms · Subprocessors https://mobileb.net/subprocessors - Capability manifest https://mobileb.net/.well-known/mobileb.json Contact: hello@mobileb.net · +1 (302) 294-9333 · Delaware, USA