diff --git a/rattail_corepos/emails.py b/rattail_corepos/emails.py
index 66dd464..644f4ce 100644
--- a/rattail_corepos/emails.py
+++ b/rattail_corepos/emails.py
@@ -62,6 +62,24 @@ class corepos_problems_invalid_person_numbers(ProblemReportEmail):
         }
 
 
+class corepos_problems_phone_numbers_too_long(ProblemReportEmail):
+    """
+    Looks for `meminfo` records with phone number which is too long to
+    properly fit in the `Customers` table.
+    """
+    default_subject = "Phone numbers too long"
+    abstract = False
+
+    def sample_data(self, request):
+        from corepos.db.office_op import model as corepos
+
+        member = corepos.MemberInfo(card_number=42,
+                                    phone='(800) 555-1234 ABCDEFGHIJKLMNOP')
+        return {
+            'problems': [member]
+        }
+
+
 class rattail_export_corepos_updates(ImporterEmail):
     """
     Sent when a Rattail -> CORE-POS API export involves data changes.
diff --git a/rattail_corepos/problems/corepos.py b/rattail_corepos/problems/corepos.py
index c4590b0..3e81172 100644
--- a/rattail_corepos/problems/corepos.py
+++ b/rattail_corepos/problems/corepos.py
@@ -56,3 +56,32 @@ class InvalidPersonNumbers(ProblemReport):
 
         core_session.close()
         return problems
+
+
+class PhoneNumbersTooLong(ProblemReport):
+    """
+    Looks for ``meminfo`` records in CORE which have a phone number
+    value which is too long to fit into the corresponding
+    ``Customers`` table column in CORE.
+    """
+    system_key = 'corepos'
+    problem_key = 'phone_numbers_too_long'
+    problem_title = "Phone numbers too long"
+
+    def find_problems(self, **kwargs):
+        problems = []
+        core_session = CoreSession()
+
+        maxlen = self.app.maxlen(corepos.Customer.phone)
+        core_members = core_session.query(corepos.MemberInfo)\
+                                   .order_by(corepos.MemberInfo.card_number)\
+                                   .all()
+
+        def inspect(member, i):
+            if member.phone and len(member.phone) > maxlen:
+                problems.append(member)
+
+        self.progress_loop(inspect, core_members,
+                           message="Looking for phone numbers too long")
+        core_session.close()
+        return problems
diff --git a/rattail_corepos/templates/mail/corepos_problems_phone_numbers_too_long.html.mako b/rattail_corepos/templates/mail/corepos_problems_phone_numbers_too_long.html.mako
new file mode 100644
index 0000000..fcb7c40
--- /dev/null
+++ b/rattail_corepos/templates/mail/corepos_problems_phone_numbers_too_long.html.mako
@@ -0,0 +1,19 @@
+## -*- coding: utf-8; -*-
+<%inherit file="/base_problems.html.mako" />
+
+<%def name="summary()">
+  <p>
+    There are ${len(problems)} member records which have a phone
+    number that is too long to properly fit in the `Customers`
+    table.&nbsp; Please investigate and fix at your convenience.
+  </p>
+</%def>
+
+<%def name="simple_row(member, i)">
+  <tr>
+    <td>${member.card_number}</td>
+    <td>${member.phone}</td>
+  </tr>
+</%def>
+
+${self.simple_table(["Card #", "Phone Number"])}