[Answered ]-Breaking out of a for loop from a nested if statement in Django

If you have to stay within the template layer you could use regroup.

{% regroup user_phones|dictsort:"primary" by primary as phones_list %}

{% for phone in phones_list %}
    {% if phone.grouper %}
    {{ phone.list.0.type }}
    {% endif %}
{% endfor %}

What it does

regroup together with the dictsort filter (which also works on querysets) groups the instances in user_phones by the value of primary.

regroup will add an attribute named grouper, which when grouping by a bool (the value of primary) will either be True or False.

for then iterates over the variable phones_list, which is provided by regroup. Since we have sorted the results by primary, {% if phone.grouper %} will tell us when we hit the group of items with primary == True.

regroup packs the items that belong to a group into the attribute list. So the first item can be accessed with phone.list.0.type, phone.list.0.phone_format, etc.

Note:
if you need to access foo.list.0 many times it can be assigned to a variable (using with):

{% regroup user_phones|dictsort:"primary" by primary as phones_list %}

{% for items in phones_list %}
    {% if items.grouper %}
    {% with items.list.0 as phone %}
    <div>{% if phone.type %}{{ phone.type|title }}: {% endif %}<span itemprop="telephone">{{ phone.phone_format }}</span></div>
    {% endwith %}
    {% endif %}
{% endfor %}

There is no break in Django templates. You may handle it in your view by storing the primary phone that you are looking for to a variable and then calling it in your template.