diff --git a/lib/registration.rb b/lib/registration.rb
index 01e8820a06f662e3133d1384394f9a950bba8bcc..3c78924f1dccdf3631f1e4c2e361f0d0e45c1eef 100644
--- a/lib/registration.rb
+++ b/lib/registration.rb
@@ -185,7 +185,8 @@ class Registration
 				REDIS.setex("pending_tel_for-#{@customer.jid}", THIRTY_DAYS, tel)
 			end
 
-			def note_text(amount, addr)
+			def note_text(rate, addr)
+				amount = CONFIG[:activation_amount] / rate
 				<<~NOTE
 					Activate your account by sending at least #{'%.6f' % amount} BTC to
 					#{addr}
@@ -195,24 +196,31 @@ class Registration
 			end
 
 			def write
-				EMPromise.all([
-					addr,
-					save,
-					BTC_SELL_PRICES.public_send(@customer.currency.to_s.downcase)
-				]).then do |(addr, _, rate)|
-					min = CONFIG[:activation_amount] / rate
-					Command.finish(
-						note_text(min, addr) + @final_message.to_s, status: :canceled
-					)
+				EMPromise.all([addr_and_rate, save]).then do |((addr, rate), _)|
+					Command.reply { |reply|
+						reply.allowed_actions = [:prev]
+						reply.status = :canceled
+						reply.note_type = :info
+						reply.note_text = note_text(rate, addr) + @final_message.to_s
+					}.then(&method(:handle_possible_prev))
 				end
 			end
 
 		protected
 
-			def addr
-				@addr ||= @customer.btc_addresses.then { |addrs|
-					addrs.first || @customer.add_btc_address
-				}
+			def handle_possible_prev(iq)
+				raise "Action not allowed" unless iq.prev?
+
+				Activation.for(@customer, @tel).then(&:write)
+			end
+
+			def addr_and_rate
+				EMPromise.all([
+					@customer.btc_addresses.then { |addrs|
+						addrs.first || @customer.add_btc_address
+					},
+					BTC_SELL_PRICES.public_send(@customer.currency.to_s.downcase)
+				])
 			end
 		end
 
@@ -247,10 +255,13 @@ class Registration
 
 			def write
 				Command.reply { |reply|
-					reply.allowed_actions = [:next]
+					reply.allowed_actions = [:next, :prev]
+					toob = oob(reply)
 					reply.note_type = :info
-					reply.note_text = "#{oob(reply).desc}: #{oob(reply).url}"
-				}.then do
+					reply.note_text = "#{toob.desc}: #{toob.url}"
+				}.then do |iq|
+					next Activation.for(@customer, @tel).then(&:write) if iq.prev?
+
 					CreditCard.for(@customer, @tel, finish: @finish).then(&:write)
 				end
 			end
@@ -342,12 +353,14 @@ class Registration
 
 			def write
 				Command.reply { |reply|
-					reply.allowed_actions = [:next]
+					reply.allowed_actions = [:next, :prev]
 					add_form(reply)
 				}.then(&method(:parse))
 			end
 
 			def parse(iq)
+				return Activation.for(@customer, @tel).then(&:write) if iq.prev?
+
 				guard_too_many_tries.then {
 					verify(iq.form.field("code")&.value&.to_s)
 				}.then {
@@ -386,7 +399,9 @@ class Registration
 		class Mail
 			Payment.kinds[:mail] = method(:new)
 
-			def initialize(_customer, _tel, final_message: nil, **)
+			def initialize(customer, tel, final_message: nil, **)
+				@customer = customer
+				@tel = tel
 				@final_message = final_message
 			end
 
@@ -412,9 +427,15 @@ class Registration
 			end
 
 			def write
-				Command.finish(status: :canceled) do |reply|
+				Command.reply { |reply|
+					reply.allowed_actions = [:prev]
+					reply.status = :canceled
 					reply.command << form
-				end
+				}.then { |iq|
+					raise "Action not allowed" unless iq.prev?
+
+					Activation.for(@customer, @tel).then(&:write)
+				}
 			end
 		end
 	end
diff --git a/lib/tel_selections.rb b/lib/tel_selections.rb
index 3006a63a94e760e27ca8f5588593c97df5d4d779..8b309d946da86a119f167b2159c756514910f0ef 100644
--- a/lib/tel_selections.rb
+++ b/lib/tel_selections.rb
@@ -49,14 +49,16 @@ class TelSelections
 		end
 
 		def choose_from_list(tns)
-			if tns.empty?
-				choose_tel(error: "No numbers found, try another search.")
-			else
-				Command.reply { |reply|
-					reply.allowed_actions = [:next]
-					reply.command << FormTemplate.render("tn_list", tns: tns)
-				}.then { |iq| iq.form.field("tel").value.to_s.strip }
-			end
+			raise "No numbers found, try another search." if tns.empty?
+
+			Command.reply { |reply|
+				reply.allowed_actions = [:next, :prev]
+				reply.command << FormTemplate.render("tn_list", tns: tns)
+			}.then { |iq|
+				next choose_tel if iq.prev?
+
+				iq.form.field("tel").value.to_s.strip
+			}
 		end
 
 		class AvailableNumber
diff --git a/test/test_registration.rb b/test/test_registration.rb
index c711411f8963ef911c1d90d87d6aa3b4114aa5cf..d4e3a8f66657cb563d937e19242f1128a6d62af3 100644
--- a/test/test_registration.rb
+++ b/test/test_registration.rb
@@ -337,9 +337,9 @@ class RegistrationTest < Minitest::Test
 					You will receive a notification when your payment is complete.
 				NOTE
 				blather = Minitest::Mock.new
-				blather.expect(
-					:<<,
-					nil,
+				Command::COMMAND_MANAGER.expect(
+					:write,
+					EMPromise.reject(SessionManager::Timeout.new),
 					[Matching.new do |reply|
 						assert_equal :canceled, reply.status
 						assert_equal :info, reply.note_type
@@ -391,7 +391,7 @@ class RegistrationTest < Minitest::Test
 						:write,
 						EMPromise.reject(:test_result),
 						[Matching.new do |reply|
-							assert_equal [:execute, :next], reply.allowed_actions
+							assert_equal [:execute, :next, :prev], reply.allowed_actions
 							assert_equal(
 								"Add credit card, then return here to continue: " \
 								"http://creditcard.example.com",